UI text upgrades (#3375)

* Clarifying auth user join button

* Update team_general_tab.jsx

* Update generated_setting.jsx

* Update public_link_settings.jsx

* Update signup_settings.jsx

* Update login_settings.jsx

* Update team_general_tab.jsx

* Update en.json

* Clarifying help text

* Clarifying help text

webapp/components/admin_console/generated_setting.jsx

@@ -28,7 +28,7 @@ export default class GeneratedSetting extends React.Component {
             regenerateText: (
                 <FormattedMessage
                     id='admin.regenerate'
-                    defaultMessage='Re-Generate'
+                    defaultMessage='Regenerate'
                 />
             )
         };