Original problem
As discussed on Meta-Wiki, the feedback link from rEWME modules/ext.wikimediaMessages.ipInfo.hooks/feedback.js should be using {{int:lang}} instead of Special:MyLanguage, as suggested by @MusikAnimal so the template works properly. In addition, the title of the section should also be populated with something like Feedback from $username.
Proposed solution
Keep using Special:MyLanguage to leverage the language fallback chain, but explicitly use the /en English translation when the user's language is English.
Testing notes
Test this by clicking on the Feedback button in the IP infobox on Special:Contributions. The link will take you away from the wiki and to meta.
If the user's language[*] on the original wiki is English, the preloaded template should be in English and no longer contain <translate> tags (regardless of the user's language on meta).
If the user's language on the original wiki is not English, and their language on meta is also not English, the preloaded template should be in the user's language on meta (even if this is different from their language in the original wiki).
If the user's language on the original wiki is not English, but their language on meta is English, they will still encounter this bug. That is hopefully an acceptable compromise for leveraging the language fallback chain in other situations.
[ * ] i.e. the language in the uselang URL parameter, or if that isn't set then the user's preferred language from their preferences, or if that isn't set then the site language