Yeah, it seems that the titles of results of global search display all languages wrapped with <span lang="XX" class="multilang">your_content_here</span>.
I've been able to reproduce this on Mount Orange:
- Create a page with a multilanguage title, like so:
- Wait a while for the page to get indexed by global search
- Set language to Russian from the language menu
- Perform a global search for 'TITLE'
Result: TITLE ENGLISHTITLE RUSSIAN is returned as the title of of the page, in both languages but strips the <span>
Expected: TITLE RUSSIAN, i.e only print the Russian <span>
Hopefully I'm not losing my mind and someone else can confirm this behavior.