Fixed #194: Scan Popup window doesn't get the keyboard focus on Linux.

Tested and verified on recent Unity, Gnome, KDE, LXDE systems.
Fixed #197: Sometimes the Scan Popup shows previous translation (Linux).
Merge pull request #196 from virtualtam/master

Added French translation
lupdate all the localizations, update Argentinian Spanish translation
Update Russian translation
Don't show welcome page header in window title (issue #195)
Call tr() function for some strings (issue #195 again)
lupdate all the localizations
Check if icon is loaded before trying to load it again
Custom icon support for babylon and dictd dictionaries
Custom user icon always override embedded icon
Update belarusian translation
Merge pull request #202 from quendimax/be-update

Update belarusian translation
Fixed #206: Suggestion list should not be bigger than the main window (on Linux).
Don't translate program name
Lupdate all translations, update Russian translation
Custom icon support for Sound dir dictionaries
On Windows x64, fixed #208: GoldenDict crashes when indexing huge dictionaries.

According to Microsoft documentation, on x64 systems the virtual address space
for 32-bit process can be extended from 2Gb to 4Gb if if the application is
compiled with the /LARGEADDRESSAWARE switch.

I verified that with this switch we get full 4Gb on x64 systems and the
indexing of huge dictionaries works just fine now.

On x32 systems we can't do much though.
Custom icon support for Sound dir dictionaries - default to no custom icon
Update Ukrainian locale
Merge pull request #210 from rkononenko/patch-1

Update Ukrainian locale