There is now a dictionary of many words found in MediaWiki software in our
core repository at *maintenance/dictionary/mediawiki.dic* If your IDE
supports code/comment spell checking, you can attach it to hide many false
errors.
The file is a one-per-line list of words. Please keep it sorted and without
duplicates.
If you use JetBrains' *PhpStorm*, go to File/Settings/Spelling, and add the
directory (not the file) to the dictionaries tab. Adding new words to
dictionary place them into mediawiki\.idea\dictionaries\User.xml or
sometimes to %userprofile%\.WebIde60\config\options\cachedDictionary.xml,
so you have to manually copy them to the .dic file, unescape xml &xxx;
entries, and sort/remove dupls.