Remove KOI8-R character set from en_US.UTF-8/XLC_LOCALE
https://gitlab.freedesktop.org/xorg/lib/libx11/-/blob/master/src/xlibi18n/lcCT.c#L58 has no escape sequence for KOI8-R. That makes Xutf8TextListToTextProperty() sometimes fail when trying to convert to COMPOUND_TEXT and when the KOI8-R charset is tried.
This is the cause for this bug:
https://github.com/ibus/ibus/issues/2422
Removing the KOI8-R charset entry fixes the problem.
This commit also fixes a few wrong texts in comments.