wikipedia: remove deprecated lang_per_channel
config setting
#2142
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Description
Tin. The "unexpected setting" warning we added in #1973 should alert bot owners if this is still kicking about in their files.
I also unrolled a couple if/else blocks into if-return because… I felt like it.
Checklist
make qa
(runsmake quality
andmake test
)Notes
I should probably make a patch for 7.1.x that logs a warning if the language for a channel is loaded from this old setting.