Update translations (from the TP).
* gettext-runtime/po/*.po: Update.
* gettext-tools/po/*.po: Update.
* gettext-tools/examples/po/*.po: Update.
* gettext-tools/examples/po/LINGUAS: Add 'nn'.
* gettext-tools/examples/hello-*/po/LINGUAS: Likewise.
* gettext-tools/examples/Makefile.am (EXAMPLESPOFILES): Add nn.po.
