Update about.md and event-sidebar.md

about.md: Changing Wikipedia URL to avoid redirect, as suggested by @loucasal on weblate.

event-sidebar.md: Removing trailing slash on forum URL, as suggested by @loucasal on weblate.

Author: femmdi

_i18n/en/general/about.md

@@ -16,7 +16,7 @@ That way, you can rest assured (or check for yourself) that there's no shady dat
 We stand for an open podcasting ecosystem. An ecosystem that
 * supports free speech, 
 * rewards podcasters for their creative work, 
-* spares listeners from inaccessible content in [walled gardens](https://en.wikipedia.org/wiki/Walled_garden_(technology)), and 
+* spares listeners from inaccessible content in [walled gardens](https://en.wikipedia.org/wiki/Closed_platform), and 
 * allows users to use and switch between apps without [vendor lock-in](https://en.wikipedia.org/wiki/Vendor_lock-in).
 
 In practice, this means you can subscribe to any RSS feed that's out there, that we make it easy for you to (financially) support podcasters, and that you can synchronise, import and export your data.

_i18n/en/general/event-sidebar.md

@@ -4,6 +4,6 @@ Are you interested in meeting the people behind AntennaPod? You'll find all the
 
 Do you know of an event in your neighbourhood and would love to meet up with AntennaPod contributors and users? Tell about the event on our forum to organise a get-together!
 
-[Propose a meet-up](https://forum.antennapod.org/)
+[Propose a meet-up](https://forum.antennapod.org)
 
 <!-- mdpo-disable --><a href="{{ site.baseurl }}/events.ics" target="_blank" data-toggle="modal" data-target="#icsModal"><!-- mdpo-enable -->Add our events to your calendar<!-- mdpo-disable --></a><!-- mdpo-enable -->