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JQMIGRATE: $(html) HTML strings must start with '<' character 
- jquery.uls.core.js :88
https://github.com/wikimedia/mediawiki-extensions-UniversalLanguageSelector/blob/fb41b2/lib/jquery.uls/src/jquery.uls.core.js#L88

> this.$menu = $( template );


If it contains text (e.g. "Hello world"), then you have to use $.fn.html() or $.parseHTML instead due to ambiguity with a css selector.

If it contains leading whitespace or '#', then $() no longer allows this for consistency and security reasons, and also, use $.parseHTML(), or fix the string to not have leading whitespace.


I think in case of ULS you just need to make sure that leading new line is gone.