(I'm assuming that Special:MyLanguage is part of the Translate extension.)
I think it would be helpful if it was possible to transclude Special:MyPage. For example, if a template is translated, the correct language version needs to be the one that is used, but one can't just input {{Special:MyLanguage/TemplateName}} to get it to work.
At some point https://www.mediawiki.org/w/index.php?title=Module:Template_translation&oldid=716205 was created which, used on the translatable template page, automatically fixed all transclusions (AKA transcluding pages, callers). The main goal of a built-in solution should probably be this: make it possible for a template to become translatable without requiring edits to all transcluding pages.
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**Version**: unspecified
**Severity**: enhancement
**See Also**:
https://bugzilla.wikimedia.org/show_bug.cgi?id=61695
https://bugzilla.wikimedia.org/show_bug.cgi?id=57603