Display "Share" alt text for share action icon (#26158)

Downstreaming of https://github.com/owncloud/core/pull/26158

Signed-off-by: Lukas Reschke <lukas@statuscode.ch>

apps/files_sharing/js/share.js

@@ -141,6 +141,7 @@
 			fileActions.registerAction({
 				name: 'Share',
 				displayName: '',
+				altText: t('core', 'Share'),
 				mime: 'all',
 				permissions: OC.PERMISSION_ALL,
 				iconClass: 'icon-share',

core/js/share.js

@@ -306,7 +306,7 @@ OC.Share = _.extend(OC.Share || {}, {
 			}
 		}
 		else {
-			action.html('<span></span>').prepend(icon);
+			action.html('<span class="hidden-visually">' + t('core', 'Shared') + '</span>').prepend(icon);
 		}
 		if (hasLink) {
 			iconClass = 'icon-public';