chore: update transifex links

Signed-off-by: Daniel Kesselberg <mail@danielkesselberg.de>

Author: kesselb

README.rst

@@ -105,7 +105,7 @@ which if you have privacy enabled will be github.username@users.noreply.github.c
 Translations
 ------------
 
-`Help translate the documentation <https://www.transifex.com/nextcloud/nextcloud-user-documentation/dashboard/>`_.
+`Help translate the documentation <https://explore.transifex.com/nextcloud/nextcloud-user-documentation/>`_.
 
 For developers that want to ease the translation process, please read `this documentation <https://docs.transifex.com/integrations/sphinx-doc>`_.
 

developer_manual/index.rst

@@ -5,7 +5,7 @@ Nextcloud developer documentation
 =================================
 
 .. _Nextcloud App Store: https://apps.nextcloud.com/
-.. _Translation: https://www.transifex.com/nextcloud/
+.. _Translation: https://explore.transifex.com/nextcloud/
 .. _Documentation: https://github.com/nextcloud/documentation#nextcloud-documentation
 
 Table of contents

user_manual/index.rst

@@ -17,4 +17,4 @@ them with your Nextcloud server. Place files in your local shared directories,
 and those files are immediately synchronized to the server and to other devices
 using the Nextcloud Desktop Sync Client, Android app, or iOS app.
 
-`Help translate <https://www.transifex.com/nextcloud/nextcloud-user-documentation/>`_.
+`Help translate <https://explore.transifex.com/nextcloud/nextcloud-user-documentation/>`_.