forms: Mark a bunch of error strings for translation.
forms: Mark a bunch of error strings for translation.

These error messages weren't marked for translation.
DEACTIVATED_ACCOUNT_ERROR and PASSWORD_TOO_WEAK_ERROR are used in
several places and imported, so we can't move them to be in-line errors
and we keep them at top-level, marked with gettext_lazy.

rht/zulip,zulip/zulip,kou/zulip,andersk/zulip,zulip/zulip,rht/zulip,zulip/zulip,zulip/zulip,andersk/zulip,zulip/zulip,kou/zulip,zulip/zulip,kou/zulip,kou/zulip,andersk/zulip,andersk/zulip,andersk/zulip,andersk/zulip,rht/zulip,rht/zulip,kou/zulip,rht/zulip,kou/zulip,andersk/zulip,kou/zulip,rht/zulip,zulip/zulip,rht/zulip