Capitalize shared|community visibility for images

Added new visibility type `shared` and `community` to be
displayed in capital case as `Shared` or `Community` in
image listing page.
Similar to
`public` ==> `Public`
`private` ==> `Private`
`

Closes Bug: #1700546

Change-Id: Ia82bcd026412ad14a98dd5dca5b83eee14113e59

openstack_dashboard/static/app/core/images/filters/image-visibility.filter.js

@@ -62,6 +62,8 @@
     var imageVisibility = {
       'public': gettext('Public'),
       'private': gettext('Private'),
+      'shared': gettext('Shared'),
+      'community': gettext('Community'),
       'other': null,
       'unknown': gettext('Unknown')
     };