i18n: Remove markup from network error strings.
i18n: Remove markup from network error strings.

This will avoid translators having to do new work when we change CSS
class names.

Also use a unicode ... character.

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