From Special:Translate, I open ULS to choose a language, I type a random string to ensure no language is found.
In suggestions under You may be interested in: section, there is 2 “Hausa” languages: the first one has got “Hausa” tiltle and data-code="ha" attribute, the second one has undefined title and data-code="ha-latn" attribute. I can select the second one and &language=ha-latn parameter is added to URL.
I am not sure about this bug origins:
- I have hacked Special:Translate using a fake &uselang value →T279252
- I have set my default language preference as Hausa (ha)
- I also tried to set my default language preference to ha-latn manually editing <select name="wplanguage"> option value.