We have these searches available:
- German: German
- Correct German: German -Ranguage
- Incorrect German: German Ranguage
- Latin: Latin
- Correct Latin: Latin -Ranguage
- Incorrect Latin: Latin Ranguage
- Spanish: Spanish
- Correct Spanish: Spanish -Ranguage
- Incorrect Spanish: Spanish Ranguage
With that in mind, then this sounds natural:
- English: English
- Correct English: English -Ranguage or English -Engrish
- Incorrect English: English Ranguage or Engrish
The tag "Engrish" exceptionally exists, because it is an established term; and, probably, simply because there are so many instances of it.
If what I said above is true, then these implications should exist:
The only obstacle I see is that the wiki of English says it is rectricted to correct English only. This additional rule apparently has not been discussed anywhere; and I think it should be taken down, for consistency. However, if we do need a special tag for correct English, it could be correct English.
The implication Engrish -> Ranguage already exists.
(Bibliography: forum #50227, forum #57613)
Updated by Fred1515