If you click on expand subcategory button for example here: https://be-tarask.wikipedia.org/wiki/Катэгорыя:Беларусь you'll get subcategory expanded, but with the following code surrounding collapse button
<span style="color:#0645AD;">▼</span>
If you click on collapse button this code won't disappear.
Can anyone help figure out the problem?
Cannot reproduce when using https://be-tarask.wikipedia.org/wiki/Катэгорыя:Беларусь?uselang=en so I expect this to be a translation mistake.
https://be-tarask.wikipedia.org/wiki/Катэгорыя:Беларусь?uselang=qqx shows the string IDs: categorytree-expand-bullet and categorytree-collapse-bullet.
I think this needs to be fixed in the translation by editing (or better: deleting) the pages https://be-tarask.wikipedia.org/wiki/MediaWiki:Categorytree-collapse-bullet and https://be-tarask.wikipedia.org/wiki/MediaWiki:Categorytree-expand-bullet . Hence closing this task as invalid as it requires no software code change.
I admit I am not sure why this problem suddenly appears, as those translation have been existing for five years already. Maybe something in the parser changed.