Use the same I18n key for "login to comment" text

We were using several different keys, all of them having the same
translations.

config/locales/en/community.yml

@@ -55,6 +55,3 @@ en:
         recommendation_one: Do not write the topic title or whole sentences in capital letters. On the internet that is considered shouting. And no one likes to be yelled at.
         recommendation_two: Any topic or comment that implies an illegal action will be eliminated, also those that intend to sabotage the spaces of the subject, everything else is allowed.
         recommendation_three: Enjoy this space, the voices that fill it, it's yours too.
-  topics:
-    show:
-      login_to_comment: You must %{signin} or %{signup} to leave a comment.

config/locales/en/general.yml

@@ -164,7 +164,6 @@ en:
       comments_title: Comments
       edit_debate_link: Edit
       flag: This debate has been flagged as inappropriate by several users.
-      login_to_comment: You must %{signin} or %{signup} to leave a comment.
       share: Share
       author: Author
     update:
@@ -462,7 +461,6 @@ en:
       comments_tab: Comments
       dashboard_proposal_link: Dashboard
       flag: This proposal has been flagged as inappropriate by several users.
-      login_to_comment: You must %{signin} or %{signup} to leave a comment.
       notifications_tab: Notifications
       milestones_tab: Milestones
       retired_warning: "The author considers this proposal should not receive more supports."
@@ -667,7 +665,6 @@ en:
       back: Back to voting
       cant_answer_not_logged_in: "You must %{signin} or %{signup} to participate."
       comments_tab: Comments
-      login_to_comment: You must %{signin} or %{signup} to leave a comment.
       signin: Sign in
       signup: Sign up
       cant_answer_verify_html: "You must %{verify_link} in order to answer."
@@ -861,6 +858,9 @@ en:
     manage:
       all: "You do not have permission to carry out the action '%{action}' on %{subject}."
   users:
+    login_to_comment: "You must %{signin} or %{signup} to leave a comment."
+    signin: Sign in
+    signup: Sign up
     direct_messages:
       new:
         body_label: Message
@@ -920,8 +920,6 @@ en:
     comment_unauthenticated: You must %{signin} or %{signup} to vote.
     disagree: I disagree
     organizations: Organizations are not permitted to vote
-    signin: Sign in
-    signup: Sign up
     supports: Supports
     unauthenticated: You must %{signin} or %{signup} to continue.
     verified_only: Only verified users can vote on proposals; %{verify_account}.

config/locales/en/legislation.yml

@@ -14,9 +14,6 @@ en:
         publish_comment: Publish Comment
       form:
         phase_not_open: This phase is not open
-        login_to_comment: You must %{signin} or %{signup} to leave a comment.
-        signin: Sign in
-        signup: Sign up
       index:
         title: Comments
         comments_about: Comments about