Remove weblate option from documentation since it is not available anymore.

docs/contributors/localization.rst

@@ -1,14 +1,7 @@
 I18N and L10N
 =============
 
-Using Weblate
--------------
-
-We are hosting our localization effort using Weblate.If you would like to contribute to the localization process, feel free to ask us to add a language then you can contribute to translations.
-
-The project : https://translate.tedomum.net/projects/mailu/admin/
-
 Using Poedit
 ------------
 
-If you prefer to work locally, Poedit is one of the best tools available out there. Feel free to commit on your own fork and pull request your translations.
+Poedit is one of the best translation editors available. Feel free to commit on your own fork and pull request your translations.