Bug 13400: Untranslatable "Are you sure you want to delete this authority?"

This patch makes the string "Are you sure you want to delete this
authority?" translatable using the function _(...)

To test, apply patch and check that deleting authorities still works.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>

Tested successfully with the following procedure:

1. Applied the patch.
2. Ran perl translate update de-DE
3. Edited de-DE-i-staff-t-prog-v-3006000.po to add a "translation"
4. Removed "#, fuzzy" marker from po entry.
5. perl translate -v install de-DE
6. Testing deleting an authority from the authority search results page
   and from the detail page. My translated string appeared correctly.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>

koha-tmpl/intranet-tmpl/prog/en/modules/authorities/detail.tt

@@ -32,7 +32,7 @@
 	 });
 
 function confirm_deletion() {
-	var is_confirmed = confirm('Are you sure you want to delete this authority?');
+	var is_confirmed = confirm(_('Are you sure you want to delete this authority?'));
 	if (is_confirmed) {
 		window.location="authorities-home.pl?op=delete&authid=[% authid %]";
 	}

koha-tmpl/intranet-tmpl/prog/en/modules/authorities/searchresultlist.tt

@@ -5,8 +5,7 @@
 <script type="text/javascript" >
 //<![CDATA[
 function confirm_deletion(id) {
-    
-    var is_confirmed = confirm('Are you sure you want to delete this authority?');
+    var is_confirmed = confirm(_('Are you sure you want to delete this authority?'));
     if (is_confirmed) {
       window.location="authorities-home.pl?op=delete"
           + "&authid=" + id