Don't show confusing busy cursor during merge summary.

When the interactive merge summary window is shown, keeping the busy
cursor is confusing: the user may rightly assume that the app is
unresponsive and just hangs there, while it's in fact fully functional.

Fixes #475, #477.
Build fix for building on OS X 10.8.

The output of the 'codesign' tool changed slightly in 10.8: the
'designated =>' line now looks exactly as it should as codesign -c
input. Previously, it was prefixed with "# ", which we had to filter
out.

Update the script to work with both 10.7 and 10.8 versions.
Fix OS X compilation without Sparkle.
Only copy wx's gettext catalogs from WX_ROOT.

If $WX_ROOT points to a shared location such as /usr/local, we don't
want to copy all the unrelated catalogs.
Fix crash on startup under Latvian locale on OS X.

If regional settings are set to something that doesn't have a
corresponding C locale in OS X (e.g. Latvian), then string formatting
silently fails. Fixed in wxWidgets by making sure LC_CTYPE is set to
UTF-8.

See http://stackoverflow.com/questions/11713745/why-does-the-printf-family-of-functions-care-about-locale

Fixes #473.
Add copyright and app category to Info.plist.
Don't attempt to migrate TM if it doesn't exists at all.
Fixes to German translation.
Update Russian translation.
Update Greek translation.
Update Slovenian translation.
Update Romanian translation.
Update Galician translation.
Update Hebrew translation.
Update Ukrainian translation.
Update Georgian translation.
Update Vietnamese translation.
Update Bosnian translation.
Fix missing Bosnian in language selector.
Set the X-Generator header.

Most other translation tools do it too, it makes sense to follow suit.