navbar: Include opening and closing braces in translation tags.
navbar: Include opening and closing braces in translation tags.

This fixes the bug introduced in the following commits.

161342a2980a9abcc39dddb34d6c72c8bb6171b3
3165ffa8e27ca0fc2f93089d03c7f87eb6a095f1

zulip/zulip,punchagan/zulip,punchagan/zulip,punchagan/zulip,eeshangarg/zulip,punchagan/zulip,punchagan/zulip,kou/zulip,zulip/zulip,kou/zulip,andersk/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,kou/zulip,hackerkid/zulip,eeshangarg/zulip,zulip/zulip,kou/zulip,eeshangarg/zulip,rht/zulip,andersk/zulip,hackerkid/zulip,andersk/zulip,rht/zulip,rht/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,hackerkid/zulip,andersk/zulip,punchagan/zulip,punchagan/zulip,kou/zulip,andersk/zulip,eeshangarg/zulip,eeshangarg/zulip,hackerkid/zulip,rht/zulip,andersk/zulip,kou/zulip,andersk/zulip,rht/zulip,hackerkid/zulip,rht/zulip,hackerkid/zulip,zulip/zulip,hackerkid/zulip,zulip/zulip