Remember that if you are checking English text, the rule messages are only in English. If you are checking French texts, the rule messages will be only in French.
I see - for example - I’m adding some spell checkers for languages not supported by LanguageTool. E.g: an English spell checker for Malaysian users. I’ve translated most of the strings in the following way, but I don’t find how to translate those two above with a custom message:
languagetool_i18n_no_errors: {
// “No errors found.”:
“it”: “Non sono stati trovati errori.”,
etc
The sentence you want to translate is in English for the English checker, and it cannot be translated. The English grammar checker has thousands of rules, and it is not feasible to translate all of them into other languages.
As I said before, if you are checking English text, the rule messages will be only in English. If you are checking French texts, the rule messages will be only in French, and so on.
I understand that it could be useful to provide translations of the messages to learners of English who are not native speakers. But LanguageTool doesn’t provide this feature.