The GUI now uses the content of the Language field from the po file
header if it is present and not empty for the language selection
PopupWidget. If not present it uses the file name as before (e.g.
ru_RU).
Also update all the translation template and all the translation files.
svn-id: r51542
In recent discussions on -devel it turned out, that this
feature is rather superfluous and instead we should rather
implement a proper error reporting in our GUI.
I also removed the dependency on iconv along with this.
svn-id: r50335
