🐛Fixed i18n for the {{meta_title}} helper (#9468)

closes #9466

- make 'page' in the meta title translatable through subexpression in the meta title helper
- e.g. `{{meta_title page=(t....)}}`

core/server/data/meta/title.js

@@ -12,7 +12,7 @@ function getTitle(data, root, options) {
     options = options ? options : {};
 
     if (pagination && pagination.total > 1) {
-        pageString = ' (Page ' + pagination.page + ')';
+        pageString = _.has(options.hash, 'page') ? options.hash.page.replace('%', pagination.page) : ' (Page ' + pagination.page + ')';
     }
 
     // If there's a specific meta title

core/server/helpers/meta_title.js

@@ -7,5 +7,5 @@ var proxy = require('./proxy'),
 
 // We use the name meta_title to match the helper for consistency:
 module.exports = function meta_title(options) { // eslint-disable-line camelcase
-    return getMetaDataTitle(this, options.data.root);
+    return getMetaDataTitle(this, options.data.root, options);
 };

core/test/unit/data/meta/title_spec.js

@@ -93,6 +93,28 @@ describe('getTitle', function () {
         title.should.equal('Tag Name - My blog title 3 (Page 39)');
     });
 
+    it('should return translated pagination-string if passed in options object', function () {
+        localSettingsCache.title = 'This is my blog title';
+
+        var title = getTitle({
+            tag: {
+                name: 'Tag Name'
+            }
+        }, {
+            context: ['tag', 'paged'],
+            pagination: {
+                total: 40,
+                page: 23
+            },
+        }, {
+            hash: {
+                page: ' p.%'
+            }
+        });
+
+        title.should.equal('Tag Name - This is my blog title p.23');
+    });
+
     it('should return tag meta_title if in tag data', function () {
         var title = getTitle({
             tag: {