Add colon to telegram message

app/subscribers/telegram_bot_subscriber.rb

@@ -29,7 +29,7 @@ class TelegramBotSubscriber
       changes.delete("stage_id")
     end
 
-    message = "<b><a href=\"#{conference_session_url(session.conference, session, host: 'rescheduled.c3lingo.org', protocol: 'https')}\">Session #{session.title}</a></b>\n<b>#{action}</b>\n" +
+    message = "<b><a href=\"#{conference_session_url(session.conference, session, host: 'rescheduled.c3lingo.org', protocol: 'https')}\">Session: #{session.title}</a></b>\n<b>#{action}</b>\n" +
       changes.map { |attr, (from, to)| "- #{attr}: #{from} -> #{to}" }.join("\n")
 
     TelegramGroupChatNotificationJob.perform_later(text: message)
@@ -45,7 +45,7 @@ class TelegramBotSubscriber
 
     return unless session.conference.relevant_stages.include? session.stage
 
-    message = "<b><a href=\"#{conference_session_url(session.conference, session, host: 'rescheduled.c3lingo.org', protocol: 'https')}\">Session #{session.title}</a></b>\n<b>Speaker Change</b>\n" +
+    message = "<b><a href=\"#{conference_session_url(session.conference, session, host: 'rescheduled.c3lingo.org', protocol: 'https')}\">Session: #{session.title}</a></b>\n<b>Speaker Change</b>\n" +
       "#{session_speaker.speaker.name} #{action == 'destroyed' ? 'removed' : 'added'}"
 
     TelegramGroupChatNotificationJob.perform_later(text: message)