Describe the bug
A clear and concise description of what the bug is.

We don't have a definiton for Conferences so it's used in the "Help sections" by default.

To Reproduce
Steps to reproduce the behavior:

1. Create a new organization without contents
2. Log in as admin
3. Go to 'Help sections' in 'Settings'
4. See that there isn't any text for Conferences.

Expected behavior
A clear and concise description of what you expected to happen.

To have a default text for conferences.

Screenshots
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Stacktrace
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Extra data (please complete the following information):

• Decidim Version: v0.23 (develop)
• Related with EPIC: Conference/events module #3709

Fix

It should be added to decidim.help in decidim-conferences/config/locales/en.yml:

+++ b/decidim-conferences/config/locales/en.yml
@@ -548,6 +548,12 @@ en:
       index:
         description: Links about this conference
         title: Media and Links
+    help:
+      participatory_spaces:
+        conferences:
+          contextual: "<p>A <strong>conference</strong> is a a collection of Meetings that are related to the same topics and occurs in the same place....</p>\n"
+          page: "<p>A <strong>conference</strong> is a a collection of Meetings that are related to the same topics and occurs in the same place....</p>\n"
+          title: What are conferences?
     menu:
       conferences: Conferences
   devise: