en to en_GB translation catalogue (4 entries)

en: Drag to move color stop. Double click to remove color stop.
en_GB: Drag to move colour stop. Double click to remove colour stop.

en: Drag to move color stop.
en_GB: Drag to move colour stop.

en: Drag to move gradient position. Double click to insert color stop.
en_GB: Drag to move gradient position. Double click to insert colour stop.

en: Center
en_GB: Centre
