Merge tag 'gitgui-0.19.0' of http://repo.or.cz/r/git-gui

git-gui 0.19.0 * tag 'gitgui-0.19.0' of http://repo.or.cz/r/git-gui: git-gui 0.19 git-gui: chmod +x po2msg, windows/git-gui.sh git-gui: fallback right pane to packed widgets with Tk 8.4 git-gui i18n: Added Bulgarian translation git-gui l10n: Add 29 more terms to glossary git-gui i18n: Initial glossary in Bulgarian