Affects at least MediaWiki:Filereadonlyerror, MediaWiki:Readonlytext, MediaWiki:Readonlywarning.
WMF projects use "administrator" to mean the sysop group, and so does every non-WMF installation I've ever seen. For that group to have DB lock privileges is pathological, especially if the editors aren't paying for hosting. Therefore, don't say so in default system messages. Possible alternatives include "database maintainer", "webmaster", or "DBA" (but not "sysadmin" or "superuser" -- it's been 20 years since the average WWW reader recognized those).