[I18N] website_forum: avoid conflict with "All" of web

Cf odoo/odoo#61641 there is a conflict with the "All" string
from website_forum and the one from web
This is a workaround to make the term from website_forum a openerp-web
translation and avoid an untranslated "All" on the runbot but the real
patch should be done at the framework level

addons/website_forum/i18n/website_forum.pot

@@ -704,6 +704,7 @@ msgid ""
 msgstr ""
 
 #. module: website_forum
+#. openerp-web
 #: code:addons/website_forum/controllers/main.py:0
 #: model_terms:ir.ui.view,arch_db:website_forum.forum_index
 #, python-format