Add i18n support for scripted Porcelains, and mark strings in
merge(-recursive), am, and rebase for i18n.
* jx/i18n-1.7.11:
i18n: merge-recursive: mark strings for translation
Remove dead code which contains bad gettext block
i18n: am: mark more strings for translation
rebase: remove obsolete and unused LONG_USAGE which breaks xgettext
i18n: Rewrite gettext messages start with dash
i18n: rebase: mark messages for translation
i18n: New keywords for xgettext extraction from sh