I18n: Update translation pt (100%).

220 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation tr (92%).

204 translated messages, 16 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation da (100%).

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Transifex (https://www.transifex.com/projects/p/xfce/).
Add optional blurring on shadow on text of icons. In general backported gtk+-3 code to implement it.. Add a new property called "shadow-blur-radius" on gtkrc file. If the "shadow-blur-radius" does not exist or is zero, it is shaded as before. If greater than 1, applies blur.

Signed-off-by: Eric Koegel <eric.koegel@gmail.com>