You can check if a PO file is valid with the following command:

        msgfmt -c -o /dev/null <po file>
      

The following errors were found in neovim 's PO files:

gettext: src/nvim/po/sr.po:473: duplicate message definition...
src/nvim/po/sr.po:455: ...this is the location of the first definition
src/nvim/po/sr.po:1332: duplicate message definition...
src/nvim/po/sr.po:505: ...this is the location of the first definition
src/nvim/po/sr.po:1336: duplicate message definition...
src/nvim/po/sr.po:509: ...this is the location of the first definition
src/nvim/po/sr.po:1340: duplicate message definition...
src/nvim/po/sr.po:513: ...this is the location of the first definition
src/nvim/po/sr.po:1344: duplicate message definition...
src/nvim/po/sr.po:517: ...this is the location of the first definition
src/nvim/po/sr.po:1348: duplicate message definition...
src/nvim/po/sr.po:521: ...this is the location of the first definition
src/nvim/po/sr.po:1351: duplicate message definition...
src/nvim/po/sr.po:524: ...this is the location of the first definition
src/nvim/po/sr.po:1355: duplicate message definition...
src/nvim/po/sr.po:528: ...this is the location of the first definition
src/nvim/po/sr.po:1359: duplicate message definition...
src/nvim/po/sr.po:532: ...this is the location of the first definition
src/nvim/po/sr.po:1363: duplicate message definition...
src/nvim/po/sr.po:536: ...this is the location of the first definition
src/nvim/po/sr.po:1366: duplicate message definition...
src/nvim/po/sr.po:539: ...this is the location of the first definition
src/nvim/po/sr.po:1370: duplicate message definition...
src/nvim/po/sr.po:543: ...this is the location of the first definition
src/nvim/po/sr.po:1374: duplicate message definition...
src/nvim/po/sr.po:547: ...this is the location of the first definition
src/nvim/po/sr.po:1395: duplicate message definition...
src/nvim/po/sr.po:25: ...this is the location of the first definition
src/nvim/po/sr.po:1398: duplicate message definition...
src/nvim/po/sr.po:28: ...this is the location of the first definition
src/nvim/po/sr.po:1401: duplicate message definition...
src/nvim/po/sr.po:31: ...this is the location of the first definition
src/nvim/po/sr.po:1855: duplicate message definition...
src/nvim/po/sr.po:317: ...this is the location of the first definition
src/nvim/po/sr.po:1864: duplicate message definition...
src/nvim/po/sr.po:297: ...this is the location of the first definition
src/nvim/po/sr.po:1909: duplicate message definition...
src/nvim/po/sr.po:386: ...this is the location of the first definition
src/nvim/po/sr.po:1912: duplicate message definition...
src/nvim/po/sr.po:389: ...this is the location of the first definition
src/nvim/po/sr.po:1935: duplicate message definition...
src/nvim/po/sr.po:300: ...this is the location of the first definition
src/nvim/po/sr.po:1938: duplicate message definition...
src/nvim/po/sr.po:303: ...this is the location of the first definition
src/nvim/po/sr.po:1943: duplicate message definition...
src/nvim/po/sr.po:308: ...this is the location of the first definition
src/nvim/po/sr.po:1946: duplicate message definition...
src/nvim/po/sr.po:311: ...this is the location of the first definition
src/nvim/po/sr.po:1949: duplicate message definition...
src/nvim/po/sr.po:314: ...this is the location of the first definition
src/nvim/po/sr.po:1952: duplicate message definition...
src/nvim/po/sr.po:320: ...this is the location of the first definition
src/nvim/po/sr.po:1955: duplicate message definition...
src/nvim/po/sr.po:323: ...this is the location of the first definition
src/nvim/po/sr.po:1958: duplicate message definition...
src/nvim/po/sr.po:326: ...this is the location of the first definition
src/nvim/po/sr.po:1961: duplicate message definition...
src/nvim/po/sr.po:329: ...this is the location of the first definition
src/nvim/po/sr.po:1965: duplicate message definition...
src/nvim/po/sr.po:332: ...this is the location of the first definition
src/nvim/po/sr.po:1969: duplicate message definition...
src/nvim/po/sr.po:336: ...this is the location of the first definition
src/nvim/po/sr.po:1973: duplicate message definition...
src/nvim/po/sr.po:339: ...this is the location of the first definition
src/nvim/po/sr.po:1977: duplicate message definition...
src/nvim/po/sr.po:342: ...this is the location of the first definition
src/nvim/po/sr.po:1981: duplicate message definition...
src/nvim/po/sr.po:345: ...this is the location of the first definition
src/nvim/po/sr.po:1984: duplicate message definition...
src/nvim/po/sr.po:348: ...this is the location of the first definition
src/nvim/po/sr.po:1987: duplicate message definition...
src/nvim/po/sr.po:351: ...this is the location of the first definition
src/nvim/po/sr.po:1990: duplicate message definition...
src/nvim/po/sr.po:354: ...this is the location of the first definition
src/nvim/po/sr.po:1993: duplicate message definition...
src/nvim/po/sr.po:357: ...this is the location of the first definition
src/nvim/po/sr.po:1996: duplicate message definition...
src/nvim/po/sr.po:360: ...this is the location of the first definition
src/nvim/po/sr.po:1999: duplicate message definition...
src/nvim/po/sr.po:363: ...this is the location of the first definition
src/nvim/po/sr.po:2005: duplicate message definition...
src/nvim/po/sr.po:371: ...this is the location of the first definition
src/nvim/po/sr.po:2012: duplicate message definition...
src/nvim/po/sr.po:376: ...this is the location of the first definition
src/nvim/po/sr.po:2015: duplicate message definition...
src/nvim/po/sr.po:379: ...this is the location of the first definition
src/nvim/po/sr.po:2019: duplicate message definition...
src/nvim/po/sr.po:383: ...this is the location of the first definition
src/nvim/po/sr.po:2022: duplicate message definition...
src/nvim/po/sr.po:392: ...this is the location of the first definition
src/nvim/po/sr.po:2025: duplicate message definition...
src/nvim/po/sr.po:294: ...this is the location of the first definition
src/nvim/po/sr.po:2028: duplicate message definition...
src/nvim/po/sr.po:395: ...this is the location of the first definition
src/nvim/po/sr.po:2031: duplicate message definition...
src/nvim/po/sr.po:398: ...this is the location of the first definition
src/nvim/po/sr.po:2034: duplicate message definition...
src/nvim/po/sr.po:401: ...this is the location of the first definition
src/nvim/po/sr.po:2037: duplicate message definition...
src/nvim/po/sr.po:404: ...this is the location of the first definition
src/nvim/po/sr.po:2040: duplicate message definition...
src/nvim/po/sr.po:407: ...this is the location of the first definition
src/nvim/po/sr.po:2043: duplicate message definition...
src/nvim/po/sr.po:410: ...this is the location of the first definition
src/nvim/po/sr.po:2046: duplicate message definition...
src/nvim/po/sr.po:413: ...this is the location of the first definition
src/nvim/po/sr.po:2049: duplicate message definition...
src/nvim/po/sr.po:418: ...this is the location of the first definition
src/nvim/po/sr.po:2056: duplicate message definition...
src/nvim/po/sr.po:423: ...this is the location of the first definition
src/nvim/po/sr.po:2097: duplicate message definition...
src/nvim/po/sr.po:288: ...this is the location of the first definition
src/nvim/po/sr.po:2100: duplicate message definition...
src/nvim/po/sr.po:291: ...this is the location of the first definition
src/nvim/po/sr.po:2180: duplicate message definition...
src/nvim/po/sr.po:989: ...this is the location of the first definition
src/nvim/po/sr.po:2969: duplicate message definition...
src/nvim/po/sr.po:611: ...this is the location of the first definition
src/nvim/po/sr.po:2972: duplicate message definition...
src/nvim/po/sr.po:614: ...this is the location of the first definition
src/nvim/po/sr.po:2975: duplicate message definition...
src/nvim/po/sr.po:617: ...this is the location of the first definition
src/nvim/po/sr.po:2978: duplicate message definition...
src/nvim/po/sr.po:620: ...this is the location of the first definition
src/nvim/po/sr.po:2981: duplicate message definition...
src/nvim/po/sr.po:623: ...this is the location of the first definition
src/nvim/po/sr.po:2984: duplicate message definition...
src/nvim/po/sr.po:626: ...this is the location of the first definition
src/nvim/po/sr.po:2987: duplicate message definition...
src/nvim/po/sr.po:629: ...this is the location of the first definition
src/nvim/po/sr.po:2990: duplicate message definition...
src/nvim/po/sr.po:632: ...this is the location of the first definition
src/nvim/po/sr.po:2993: duplicate message definition...
src/nvim/po/sr.po:635: ...this is the location of the first definition
src/nvim/po/sr.po:2996: duplicate message definition...
src/nvim/po/sr.po:638: ...this is the location of the first definition
src/nvim/po/sr.po:2999: duplicate message definition...
src/nvim/po/sr.po:641: ...this is the location of the first definition
src/nvim/po/sr.po:3002: duplicate message definition...
src/nvim/po/sr.po:644: ...this is the location of the first definition
src/nvim/po/sr.po:3005: duplicate message definition...
src/nvim/po/sr.po:647: ...this is the location of the first definition
src/nvim/po/sr.po:3008: duplicate message definition...
src/nvim/po/sr.po:650: ...this is the location of the first definition
src/nvim/po/sr.po:3011: duplicate message definition...
src/nvim/po/sr.po:653: ...this is the location of the first definition
src/nvim/po/sr.po:3014: duplicate message definition...
src/nvim/po/sr.po:656: ...this is the location of the first definition
src/nvim/po/sr.po:3017: duplicate message definition...
src/nvim/po/sr.po:659: ...this is the location of the first definition
src/nvim/po/sr.po:3020: duplicate message definition...
src/nvim/po/sr.po:662: ...this is the location of the first definition
src/nvim/po/sr.po:3023: duplicate message definition...
src/nvim/po/sr.po:665: ...this is the location of the first definition
src/nvim/po/sr.po:3027: duplicate message definition...
src/nvim/po/sr.po:669: ...this is the location of the first definition
src/nvim/po/sr.po:3030: duplicate message definition...
src/nvim/po/sr.po:672: ...this is the location of the first definition
src/nvim/po/sr.po:3033: duplicate message definition...
src/nvim/po/sr.po:675: ...this is the location of the first definition
src/nvim/po/sr.po:3036: duplicate message definition...
src/nvim/po/sr.po:925: ...this is the location of the first definition
src/nvim/po/sr.po:3040: duplicate message definition...
src/nvim/po/sr.po:679: ...this is the location of the first definition
src/nvim/po/sr.po:3043: duplicate message definition...
src/nvim/po/sr.po:682: ...this is the location of the first definition
src/nvim/po/sr.po:3046: duplicate message definition...
src/nvim/po/sr.po:685: ...this is the location of the first definition
src/nvim/po/sr.po:3049: duplicate message definition...
src/nvim/po/sr.po:688: ...this is the location of the first definition
src/nvim/po/sr.po:3052: duplicate message definition...
src/nvim/po/sr.po:691: ...this is the location of the first definition
src/nvim/po/sr.po:3055: duplicate message definition...
src/nvim/po/sr.po:694: ...this is the location of the first definition
src/nvim/po/sr.po:3058: duplicate message definition...
src/nvim/po/sr.po:697: ...this is the location of the first definition
src/nvim/po/sr.po:3061: duplicate message definition...
src/nvim/po/sr.po:700: ...this is the location of the first definition
src/nvim/po/sr.po:3065: duplicate message definition...
src/nvim/po/sr.po:704: ...this is the location of the first definition
src/nvim/po/sr.po:3069: duplicate message definition...
src/nvim/po/sr.po:708: ...this is the location of the first definition
src/nvim/po/sr.po:3088: duplicate message definition...
src/nvim/po/sr.po:1002: ...this is the location of the first definition
src/nvim/po/sr.po:3091: duplicate message definition...
src/nvim/po/sr.po:1005: ...this is the location of the first definition
src/nvim/po/sr.po:3094: duplicate message definition...
src/nvim/po/sr.po:1008: ...this is the location of the first definition
src/nvim/po/sr.po:3097: duplicate message definition...
src/nvim/po/sr.po:1011: ...this is the location of the first definition
src/nvim/po/sr.po:3100: duplicate message definition...
src/nvim/po/sr.po:906: ...this is the location of the first definition
src/nvim/po/sr.po:3103: duplicate message definition...
src/nvim/po/sr.po:909: ...this is the location of the first definition
src/nvim/po/sr.po:3106: duplicate message definition...
src/nvim/po/sr.po:922: ...this is the location of the first definition
src/nvim/po/sr.po:3112: duplicate message definition...
src/nvim/po/sr.po:986: ...this is the location of the first definition
src/nvim/po/sr.po:3115: duplicate message definition...
src/nvim/po/sr.po:992: ...this is the location of the first definition
src/nvim/po/sr.po:3550: duplicate message definition...
src/nvim/po/sr.po:2258: ...this is the location of the first definition
src/nvim/po/sr.po:3554: duplicate message definition...
src/nvim/po/sr.po:2262: ...this is the location of the first definition
src/nvim/po/sr.po:3558: duplicate message definition...
src/nvim/po/sr.po:2266: ...this is the location of the first definition
src/nvim/po/sr.po:3562: duplicate message definition...
src/nvim/po/sr.po:2270: ...this is the location of the first definition
src/nvim/po/sr.po:3565: duplicate message definition...
src/nvim/po/sr.po:2273: ...this is the location of the first definition
src/nvim/po/sr.po:3568: duplicate message definition...
src/nvim/po/sr.po:2276: ...this is the location of the first definition
src/nvim/po/sr.po:3571: duplicate message definition...
src/nvim/po/sr.po:2279: ...this is the location of the first definition
src/nvim/po/sr.po:3637: duplicate message definition...
src/nvim/po/sr.po:2528: ...this is the location of the first definition
src/nvim/po/sr.po:3640: duplicate message definition...
src/nvim/po/sr.po:2531: ...this is the location of the first definition
src/nvim/po/sr.po:3643: duplicate message definition...
src/nvim/po/sr.po:2534: ...this is the location of the first definition
src/nvim/po/sr.po:3646: duplicate message definition...
src/nvim/po/sr.po:2537: ...this is the location of the first definition
src/nvim/po/sr.po:3650: duplicate message definition...
src/nvim/po/sr.po:2541: ...this is the location of the first definition
src/nvim/po/sr.po:3653: duplicate message definition...
src/nvim/po/sr.po:2544: ...this is the location of the first definition
src/nvim/po/sr.po:4213: duplicate message definition...
src/nvim/po/sr.po:2187: ...this is the location of the first definition
src/nvim/po/sr.po:4216: duplicate message definition...
src/nvim/po/sr.po:2190: ...this is the location of the first definition
src/nvim/po/sr.po:4219: duplicate message definition...
src/nvim/po/sr.po:2193: ...this is the location of the first definition
src/nvim/po/sr.po:4222: duplicate message definition...
src/nvim/po/sr.po:2196: ...this is the location of the first definition
src/nvim/po/sr.po:4234: duplicate message definition...
src/nvim/po/sr.po:426: ...this is the location of the first definition
src/nvim/po/sr.po:4308: duplicate message definition...
src/nvim/po/sr.po:2202: ...this is the location of the first definition
src/nvim/po/sr.po:4312: duplicate message definition...
src/nvim/po/sr.po:2208: ...this is the location of the first definition
src/nvim/po/sr.po:4320: duplicate message definition...
src/nvim/po/sr.po:2214: ...this is the location of the first definition
src/nvim/po/sr.po:4324: duplicate message definition...
src/nvim/po/sr.po:2218: ...this is the location of the first definition
src/nvim/po/sr.po:4328: duplicate message definition...
src/nvim/po/sr.po:2222: ...this is the location of the first definition
src/nvim/po/sr.po:4332: duplicate message definition...
src/nvim/po/sr.po:2226: ...this is the location of the first definition
src/nvim/po/sr.po:4847: duplicate message definition...
src/nvim/po/sr.po:1378: ...this is the location of the first definition
src/nvim/po/sr.po:4928: duplicate message definition...
src/nvim/po/sr.po:999: ...this is the location of the first definition
src/nvim/po/sr.po:5111: duplicate message definition...
src/nvim/po/sr.po:5090: ...this is the location of the first definition
src/nvim/po/sr.po:5176: duplicate message definition...
src/nvim/po/sr.po:1410: ...this is the location of the first definition
src/nvim/po/sr.po:5180: duplicate message definition...
src/nvim/po/sr.po:1414: ...this is the location of the first definition
src/nvim/po/sr.po:5184: duplicate message definition...
src/nvim/po/sr.po:1418: ...this is the location of the first definition
src/nvim/po/sr.po:5187: duplicate message definition...
src/nvim/po/sr.po:1431: ...this is the location of the first definition
src/nvim/po/sr.po:5191: duplicate message definition...
src/nvim/po/sr.po:1435: ...this is the location of the first definition
src/nvim/po/sr.po:5195: duplicate message definition...
src/nvim/po/sr.po:1439: ...this is the location of the first definition
src/nvim/po/sr.po:5199: duplicate message definition...
src/nvim/po/sr.po:1443: ...this is the location of the first definition
src/nvim/po/sr.po:5203: duplicate message definition...
src/nvim/po/sr.po:1447: ...this is the location of the first definition
src/nvim/po/sr.po:5207: duplicate message definition...
src/nvim/po/sr.po:1451: ...this is the location of the first definition
src/nvim/po/sr.po:5211: duplicate message definition...
src/nvim/po/sr.po:1455: ...this is the location of the first definition
src/nvim/po/sr.po:5215: duplicate message definition...
src/nvim/po/sr.po:1459: ...this is the location of the first definition
src/nvim/po/sr.po:5218: duplicate message definition...
src/nvim/po/sr.po:1462: ...this is the location of the first definition
src/nvim/po/sr.po:5221: duplicate message definition...
src/nvim/po/sr.po:1465: ...this is the location of the first definition
src/nvim/po/sr.po:5224: duplicate message definition...
src/nvim/po/sr.po:1468: ...this is the location of the first definition
src/nvim/po/sr.po:5227: duplicate message definition...
src/nvim/po/sr.po:1471: ...this is the location of the first definition
src/nvim/po/sr.po:5230: duplicate message definition...
src/nvim/po/sr.po:1474: ...this is the location of the first definition
src/nvim/po/sr.po:5233: duplicate message definition...
src/nvim/po/sr.po:1477: ...this is the location of the first definition
src/nvim/po/sr.po:5236: duplicate message definition...
src/nvim/po/sr.po:1480: ...this is the location of the first definition
src/nvim/po/sr.po:5246: duplicate message definition...
src/nvim/po/sr.po:1483: ...this is the location of the first definition
src/nvim/po/sr.po:5314: duplicate message definition...
src/nvim/po/sr.po:1327: ...this is the location of the first definition
src/nvim/po/sr.po:5336: duplicate message definition...
src/nvim/po/sr.po:1292: ...this is the location of the first definition
src/nvim/po/sr.po:5340: duplicate message definition...
src/nvim/po/sr.po:1296: ...this is the location of the first definition
src/nvim/po/sr.po:5344: duplicate message definition...
src/nvim/po/sr.po:1300: ...this is the location of the first definition
src/nvim/po/sr.po:5348: duplicate message definition...
src/nvim/po/sr.po:1318: ...this is the location of the first definition
src/nvim/po/sr.po:5351: duplicate message definition...
src/nvim/po/sr.po:1303: ...this is the location of the first definition
src/nvim/po/sr.po:5358: duplicate message definition...
src/nvim/po/sr.po:1310: ...this is the location of the first definition
src/nvim/po/sr.po:5362: duplicate message definition...
src/nvim/po/sr.po:1286: ...this is the location of the first definition
src/nvim/po/sr.po:5365: duplicate message definition...
src/nvim/po/sr.po:1289: ...this is the location of the first definition
src/nvim/po/sr.po:5368: duplicate message definition...
src/nvim/po/sr.po:1321: ...this is the location of the first definition
src/nvim/po/sr.po:5371: duplicate message definition...
src/nvim/po/sr.po:1324: ...this is the location of the first definition
src/nvim/po/sr.po:6260: duplicate message definition...
src/nvim/po/sr.po:1559: ...this is the location of the first definition
src/nvim/po/sr.po:6264: duplicate message definition...
src/nvim/po/sr.po:1599: ...this is the location of the first definition
src/nvim/po/sr.po:6268: duplicate message definition...
src/nvim/po/sr.po:1603: ...this is the location of the first definition
src/nvim/po/sr.po:6271: duplicate message definition...
src/nvim/po/sr.po:1606: ...this is the location of the first definition
src/nvim/po/sr.po:6274: duplicate message definition...
src/nvim/po/sr.po:1609: ...this is the location of the first definition
src/nvim/po/sr.po:6277: duplicate message definition...
src/nvim/po/sr.po:1562: ...this is the location of the first definition
src/nvim/po/sr.po:6280: duplicate message definition...
src/nvim/po/sr.po:1565: ...this is the location of the first definition
src/nvim/po/sr.po:6283: duplicate message definition...
src/nvim/po/sr.po:1568: ...this is the location of the first definition
src/nvim/po/sr.po:6286: duplicate message definition...
src/nvim/po/sr.po:1571: ...this is the location of the first definition
src/nvim/po/sr.po:6289: duplicate message definition...
src/nvim/po/sr.po:1574: ...this is the location of the first definition
src/nvim/po/sr.po:6292: duplicate message definition...
src/nvim/po/sr.po:1577: ...this is the location of the first definition
src/nvim/po/sr.po:6299: duplicate message definition...
src/nvim/po/sr.po:1584: ...this is the location of the first definition
src/nvim/po/sr.po:6302: duplicate message definition...
src/nvim/po/sr.po:1587: ...this is the location of the first definition
src/nvim/po/sr.po:6305: duplicate message definition...
src/nvim/po/sr.po:1590: ...this is the location of the first definition
src/nvim/po/sr.po:6310: duplicate message definition...
src/nvim/po/sr.po:1595: ...this is the location of the first definition
src/nvim/po/sr.po:6754: duplicate message definition...
src/nvim/po/sr.po:2229: ...this is the location of the first definition
src/nvim/po/sr.po:6758: duplicate message definition...
src/nvim/po/sr.po:2233: ...this is the location of the first definition
src/nvim/po/sr.po:7056: duplicate message definition...
src/nvim/po/sr.po:715: ...this is the location of the first definition
src/nvim/po/sr.po:7060: duplicate message definition...
src/nvim/po/sr.po:725: ...this is the location of the first definition
src/nvim/po/sr.po:7064: duplicate message definition...
src/nvim/po/sr.po:729: ...this is the location of the first definition
src/nvim/po/sr.po:7078: duplicate message definition...
src/nvim/po/sr.po:916: ...this is the location of the first definition
src/nvim/po/sr.po:7221: duplicate message definition...
src/nvim/po/sr.po:913: ...this is the location of the first definition
msgfmt: found 179 fatal errors
      

Please ask the translator (identified by the Last-Translator field in the PO file), the language team (identified by the Language-Team field) or debian-i18n for a fix.