Thanks for the reply, Umherirrender.
May 6 2016
May 2 2016
Here is an example (from als.wikiquote.org) so you can see what I mean:
May 1 2016
I should add that I tested this in wikis where the default language of the wiki itself is not English, so this doesn't seem related to the language of the wiki, just the user language. If the bug can at least be fixed so that MediaWiki:Message/langOfTheWiki instead of MediaWiki:Message/en is returned, that would also be an acceptable solution.
Oct 10 2015
Browsers automatically remember text entered into input boxes, so the question is how to make that work with WikiEditor's search and replace input boxes. They need to have name attributes, also maybe they need to be in a form (with onsubmit="return false;") and the Search and Replace buttons need to be Submit buttons. I haven't tested these yet.
Here is how I did it (removing the unnecessary vertical padding). It looks really nice that way. (I also added a border because I thought it was needed with the smaller padding.)
Oct 3 2015
And with ?debug=true Firefox shows that the "$.uls is undefined" error is at ext.cx.interlanguagelink.js:56:0
I Chromium with Content Translation on I also get the error TypeError: Cannot read property 'data' of undefined