Translations fixes

Do not translate strings, which should not be translated
Remove unnecessary/unused strings.
Use UCS-2 LE encoding for windows resource file
Update Portuguese translation by Sérgio Marques.
Update translations.
Merge pull request #739 from Gelmir/rc_proper_encoding

Use UCS-2 LE encoding for windows resource file
Merge pull request #736 from Gelmir/tr_drop_unneeded

Translations fixes
Norwegian translation by Tomaso.
Preserve original style on about dialog.
Updated translations.