Fix the carousel in the Story. Bug #10915

Add a template variables for the photoWidth from the Story's Archive.
Document the new template variable, with i18n.
Modify both Archive and Topic templates.

lib/WebGUI/i18n/English/Asset_Story.pm

@@ -418,6 +418,12 @@ our $I18N = {
         lastUpdated => 0,
     },
 
+    'photoWidth' => {
+        message => q|The width of photos, set in the Story Archive for this Story.|,
+        context => q|Template variable|,
+        lastUpdated => 0,
+    },
+
     'hasPhoto' => {
         message => q|This template variable will be true if the a photo in the photo_loop has an image in it.|,
         context => q|Template variable|,