May 21 2019
I've retracted the patch to the language data on GitHub. There is too much debate on autonyms, and there is not the right place. All proposed autonyms here should first be fully sourced and approved by @Nikerabbit or @Amire80 before I'll create a patch.
May 19 2019
Just a reminder: I discussed the missing autonyms with @Nikerabbit, and we agreed that we shouldn't add incomplete language data. Please ensure there are verifiable/sourced autonyms for all language codes you would like added. At the moment, they are missing for rmc, rml, rmn, rmo.
May 18 2019
Submitted https://github.com/wikimedia/language-data/pull/53 containing source data that will be used in ULS.
Submitted https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/cldr/+/511048/ to complete adding the language codes mentioned in this ticket to the CLDR extension.