Add the option to disable languages managment to cover special cases

We understand languages management as the ability to add new languages
or remove existing ones. When no option is passed it will allow language
manipulation by default.

There are 3 special places where we want block languages management:
- admin legislation processes homepage
- admin legislation processes milestones summary
- proposals retired form

Co-Authored-By: Sebastia <sebastia.roig@gmail.com>

app/views/admin/legislation/homepages/_form.html.erb

@@ -1,6 +1,7 @@
 <%= render "shared/globalize_locales",
            resource: @process,
-           display_style: lambda { |locale| enable_translation_style(@process, locale) } %>
+           display_style: lambda { |locale| enable_translation_style(@process, locale) },
+           manage_languages: false %>
 
 <%= translatable_form_for [:admin, @process], url: url, html: {data: {watch_changes: true}} do |f| %>
 

app/views/admin/legislation/milestones/_summary_form.html.erb

@@ -1,6 +1,7 @@
 <%= render "shared/globalize_locales",
            resource: @process,
-           display_style: lambda { |locale| enable_translation_style(@process, locale) } %>
+           display_style: lambda { |locale| enable_translation_style(@process, locale) },
+           manage_languages: false %>
 
 <%= translatable_form_for [:admin, @process] do |f| %>
   <div class="row">