en to unknown language translation catalogue (4 entries)

en: Fit images to square, padding with background color:
target: Fit images to square, padding with background colour:

en: Color value missing
target: Colour value missing

en: Color value invalid
target: Colour value invalid

en: Background color is in RGB hex format; 000000 is black, FFFFFF is white.
target: Background colour is in RGB hex format; 000000 is black, FFFFFF is white.
