[CORL-650] remove duplicate text in invite form (#2608)

* remove duplicate text in invite form

* fix: reused message key

- message change consituted a grammar change
  that wasn't reflected in other translated languages

src/core/client/admin/routes/Community/InviteUsers/InviteUsersForm.tsx

@@ -98,11 +98,11 @@ const InviteForm: FunctionComponent<Props> = ({ lastRef, onFinish }) => {
                         strong={<strong />}
                       >
                         <Typography>
-                          Moderator role: Moderator role: Receives a “Staff”
-                          badge, and comments are automatically approved. Has
-                          full moderation privileges (approve, reject and
-                          feature comments). Can configure individual articles
-                          but no site-wide configuration privileges.
+                          Moderator role: Receives a “Staff” badge, and comments
+                          are automatically approved. Has full moderation
+                          privileges (approve, reject and feature comments). Can
+                          configure individual articles but no site-wide
+                          configuration privileges.
                         </Typography>
                       </Localized>
                     );

src/locales/en-US/admin.ftl

@@ -683,7 +683,7 @@ community-invite-role-staff =
   comments are automatically approved. Cannot moderate
   or change any { -product-name } configuration.
 community-invite-role-moderator =
-  <strong>Moderator role:</strong> Moderator role: Receives a
+  <strong>Moderator role:</strong> Receives a
   “Staff” badge, and comments are automatically
   approved. Has full moderation privileges (approve,
   reject and feature comments). Can configure individual