Few changes in GUI color strings

[Pavel Sanda]

Hi,

there are few changes I'd propose for GUI color names as I got stuck several times while translating the current Zoo:

added text (output) 	-> changes - added text (exported output)
deleted text (output) 	-> changes - deleted text (exported output)
deleted text modifier (workarea) -> changes - deleted text brightness (workarea)

 - "changes" to group it with other CT items, strings like "added text (output)" are difficult to understand without context)
 - "brightness" is not exactly what will happen with non-monochromatic colors, but at least it gives some idea, "modifier" just left me baffled until I read the code

non-unique inline completion -> inline completion (non-unique)

 - to group with inline completion

math -> math text


Objections/modifications?

Pavel