[I18N] remove obsolete translation terms

settings.pot hasn't been exported since 14.0 and doesn't seem to
correspond to anything in the documentation anymore so it's probably
leftover from an old refactoring.

Note that an audit of the other pot files was done and this was the only
obsolete one found.

closes #14932

X-original-commit: 8f953a4
Signed-off-by: Louis Wicket (wil) <wil@odoo.com>
Signed-off-by: Tiffany Chang (tic) <tic@odoo.com>

Author: ticodoo