Improve ULS language search api
* Store prefixes and infixes separately in the data * First match language code, then prefixes, then infixes * Try to use suggestion either in user language or autonym first * use formatversion=2 to avoid escaping Unicode Using Language::fetchLanguageName might can have a small performance impact. On the other hand there is now check to skip languages we already found, avoiding some fuzzy matching. This is in a preparation for a change in jquery.uls to use the search API more, while trying to reduce the amount of weird autocompletion suggestions we show to the user. Bug: T73891 Change-Id: Id94c5352d9a591969bf90144d1d2d5e758d08301
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