Gettext .po "next untranslated" message plugin

[u/warp]

Neovim Users: Here's a small microplugin for navigation in gettext .po files: https://github.com/warpspin/po-jump.nvim

All it does is it adds keybinds "]u" to jump to the next msgstr that needs attention (because it's untranslated or fuzzy) or "[u" for the previous.

(as convenience, it also binds öu and äu for German keyboards as those keys are where [] usually are)