For completeness: if you want to turn topic matching back off and test the UI that normal users see, you can run step 3 but with the 1 changed to a 0:

new mw.Api().saveOption('growthexperiments-homepage-suggestededits-topics-enabled', 0).done( function() { window.location.reload() });

Arabic Wikipedia:

• No missing translations;
• The interface seems to be correct;
• Different list after re-selecting topics;
• Tested the SE module (both: Desktop and Mobile) in ar wiki, same observations as in beta: 1 to 3 less good articles compared to the test made on the API.

Vietnamese Wikipedia:

• Both desktop and mobile version are still missing some translations. Also I have some translations I want to change, can I?
• The result articles are off-topic by half. I'm working on my seed article list again, please wait...
• I have just realized that some times along the way the Vietnamese seed article list have become incorrect: In the Json list, the Science tab has now been labeled "Địa lý" (Geography) with Geography's seed articles. So now (1) there's no science label and science seed articles; (2) there's no geography tab.

I have some thoughts about the topics: they are not "equal". I mean, some are very general (science, art, education...) but some really go into detail. For example, art includes both music and films; Government is just a sub-topic of Politics; The same goes with business and economy... So you understand my point. I know that these topics are only temporary, I just wanna give some serious thoughts about them as they are an important part of our prj.

kowiki;

• Few hotfixes (including missing translations) deployed (Revision 25588448, 25588451, 25588609, 25588628, 25588634, 25588641, 25588667, 25588680) - I have a reminder to delete them once the train has stopped at Korean Wikipedia station :P
• I get different results for re-try. Some topic has less article (i.e. biography has 83 to draw from), so it might be more likely that people will notice result reuse if they try getting list quite often, though.
• Quality seems to have significantly dropped: at least 3 mismatches in all topics. (Geography got 0 correct articles in first 10, history got 4/10, music 4/10, Sports 2/10, literature 2/10, religion 2/10, pop culture 4/10, entertainment 5/10, foods 2/10, biography 4/10, military 7/10, economy 3/10, )

I spent few hours playing with the interface, and I'm now satisfied with its average performance. @Tgr explained in ambassadors' chat why the results are worse - the API link we were playing with was giving top ten matches, randomized in order, while homepage has top 250 matches, randomized in order. That's always going to be worse. Checked "Czech", please let me know if I should do anything else.

Thank you, all! Now we have a good understanding of how much effect the randomization has on the strength of the topic matches. We'll talk with the engineers about what, if anything, can be improved.

@PPham -- please make any translations and updates you want in Translatewiki, and let us know when they're there. Then we can move them to your wiki.

@MMiller_WMF It's okay now, please help me move them. Sorry for being this late...