matrix-synapse: Update description to talk about TURN configuration

Sunil:

- Minor update to the TURN server message.

- Drop updating the FAQ link since there may not be much time for translators to
translate the changed message due to our current release schedule. The old link
still works.

Signed-off-by: Joseph Nuthalapati <njoseph@riseup.net>
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>

plinth/modules/matrixsynapse/__init__.py

@@ -21,7 +21,7 @@ from plinth.modules.backups.components import BackupRestore
 from plinth.modules.coturn.components import TurnConfiguration, TurnConsumer
 from plinth.modules.firewall.components import Firewall
 from plinth.modules.letsencrypt.components import LetsEncrypt
-from plinth.utils import is_non_empty_file
+from plinth.utils import format_lazy, is_non_empty_file
 
 from . import manifest
 
@@ -41,10 +41,10 @@ _description = [
       'synchronization and does not require phone numbers to work. Users on a '
       'given Matrix server can converse with users on all other Matrix '
       'servers via federation.'),
-    _('To communicate, you can use the '
-      '<a href="https://matrix.org/docs/projects/">available clients</a> '
-      'for mobile, desktop and the web. '
-      '<a href="https://element.io/">Element</a> client is recommended.')
+    format_lazy(
+        _('Matrix Synapse needs a STUN/TURN server for audio/video calls. '
+          'Install the <a href={coturn_url}>Coturn</a> app or configure '
+          'an external server.'), coturn_url=reverse_lazy('coturn:index'))
 ]
 
 depends = ['coturn']