[wp-polyglots] GlotPress improvements

[Angelo Verona]

1. There will be good to include a local blank notes page like How translate (not how to do it, but how translate some words in context) maintained by validators.
Example: Translators please, translate trackbacks word like XXX not like YYY.
2. Add a remove translation button for suggested (one) translation
3. Add a format all translations (with some Yes and NO) and a backup after format like (restore old translation what can by deleted of course)...Slovak translation on wpcom is totally messed up.