The new auto-completion feature on wikipedia.org is lovely!
An important thing to add is lang and dir attributes on every element that is known to be in a different language. Right-to-left text is especially prone to getting jumbled if the proper dir attribute is not set, and it also affects font setting for Serbian, Korean, and so on.
As far as I could tell, elements under <div class="suggestion-text"> definitely need this. Setting it on the whole <div> may be OK, but note that this will probably also move the thumbnail to the other side, and I'll leave it to the designers to decide whether it's desirable. If it's not on the whole <div>, then it will have to be set on each <h3 class="suggestion-title"> and <p class="suggestion-description">.
If there is a staging environment for this, I'll be happy to help with testing.