Minor fix in repo_name_helper: extra comma removed

conf/locale/locale_en-GB.ini

@@ -399,7 +399,7 @@ delete_account_desc=This account is going to be deleted permanently, do you want
 [repo]
 owner=Owner
 repo_name=Repository Name
-repo_name_helper=Repository names should be short, memorable and unique. It must be one word (no spaces) and can contain letters (a-z), numbers (0-9), dash, (-), underscore (_), or dot (.) characters.
+repo_name_helper=Repository names should be short, memorable and unique. It must be one word (no spaces) and can contain letters (a-z), numbers (0-9), dash (-), underscore (_), or dot (.) characters.
 visibility=Private
 visiblity_helper=Accessible only to owner and assigned collaborators
 visiblity_helper_forced=Site admin has forced all new repositories to be <span class="ui red text">Private</span>

conf/locale/locale_en-US.ini

@@ -399,7 +399,7 @@ delete_account_desc = This account is going to be deleted permanently, do you wa
 [repo]
 owner = Owner
 repo_name = Repository Name
-repo_name_helper = Repository names should be short, memorable and unique. It must be one word (no spaces) and can contain letters (a-z), numbers (0-9), dash, (-), underscore (_), or dot (.) characters.
+repo_name_helper = Repository names should be short, memorable and unique. It must be one word (no spaces) and can contain letters (a-z), numbers (0-9), dash (-), underscore (_), or dot (.) characters.
 repo_desc_helper = The title of the dataset or other brief sentence to describe what the repository is about.
 visibility = Private
 visiblity_helper = Accessible only to owner and assigned collaborators