Updates a chunk of translated strings that overlap between files,
with the streams settings overlay being the starting point for
finding these strings, to use channel instead of stream.
Part of stream to channel rename project.
Earlier, a 'large @-mention notification' warning that pops up
for stream wildcard mentions was shown for topic wildcard mentions
too, which is incorrect.
This commit fixes the incorrect behavior. We no longer show the
banner for @-topic mentions.
We don't need a banner for @-topic mentions, as those are much less
likely to be used without thinking about it and would rarely be spammy
for a lot of people.
Fixes#27767.