copy-editing fixes for the reactions mod tool blurb

Author: Oaphi

config/locales/strings/en.mod.yml

@@ -7,5 +7,5 @@ en:
         Use them sparingly and only when needed, because they tend to get ignored if used too often.
       reactions: 'Reactions'
       reactions_blurb: >
-        Reactions can be used to give feedback to post authors and to give hints to readers regarding the usefulness, safety, ... of an post.
-        Use them sparely and only when necessary
+        Reactions can be used to give feedback to post authors and hints to post readers.
+        Use them sparingly and only when necessary.