Prepare for 0.21.1 release: Update translations.
* gettext-runtime/po/*.po: Update from TP.
* gettext-tools/po/*.po: Likewise.
* gettext-tools/examples/po/*.po: Likewise.
* gettext-tools/examples/po/LINGUAS: Add 'ka'.
* gettext-tools/examples/hello-*/po/LINGUAS: Likewise.
* gettext-tools/examples/Makefile.am (EXAMPLESPOFILES): Add ka.po.
