0.5.1 - Update copyright year - build: Bump dependency versions and fix deprecation warnings - I18n: Update po/LINGUAS list - Support the panel's deskbar mode. - I18n: Update po/LINGUAS list - build: Switch from intltool to gettext - build: Add GLib requirement - build: Fix autotools warnings - autoconf: Some updates - Update `.gitignore` - Use dist-xz for release tarballs - Translation Updates: Albanian, Amharic, Arabic, Asturian, Basque, Belarusian, Bulgarian, Catalan, Chinese (China), Chinese (Taiwan), Croatian, Czech, Danish, Dutch, Eastern Armenian, English (Australia), English (Canada), English (United Kingdom), Estonian, Finnish, French, Galician, German, Greek, Hebrew, Hungarian, Icelandic, Indonesian, Italian, Japanese, Kazakh, Korean, Lithuanian, Malay, Norwegian Bokmål, Occitan (post 1500), Persian (Iran), Polish, Portuguese, Portuguese (Brazil), Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swedish, Turkish, Ukrainian, Uyghur