Add a bit more comments. Adjust some phrases for pluralization.
Mark menu shortcuts as not translatable (changing them doesn't do any
good but people start translating "Ctrl" as "Ktrl" etc. which breaks
the shortcuts).
Pull current translations from Transifex.
Use normal but semi-transparent color instead of 'disabled' color for
counts drawing.
Do not leave empty space for icon when selected item doesn't have one.
Use null pixmaps/icons instead of non-null blank ones.
Implement our own sizeHint and minimumSizeHint to make sure both combos
have the same height.
Make activity combo width fixed, tracker combo width to fit its content
and line edit to occupy the rest.
Add 'Search...' placeholder to line edit.
Sync translations with the code. Adjust translations for changed phrases
(hopefully correct for the most of them).
One phrase still left untouched (Preferences -> Downloading), need to
think on better wording.
