Bug fix translation walker with the new doctrine2 declaration AST

lib/Gedmo/Translatable/Query/TreeWalker/TranslationWalker.php

@@ -231,10 +231,10 @@ class TranslationWalker extends SqlWalker
                     $result .= $this->components[$decl->rangeVariableDeclaration->aliasIdentificationVariable];
                 }
             }
-            foreach ($decl->joinVariableDeclarations as $joinDecl) {
-                if ($joinDecl->join instanceof Join) {
-                    if (isset($this->components[$joinDecl->join->aliasIdentificationVariable])) {
-                        $result .= $this->components[$joinDecl->join->aliasIdentificationVariable];
+            foreach ($decl->joins as $join) {
+                if ($join instanceof Join) {
+                    if (isset($this->components[$join->joinAssociationDeclaration->aliasIdentificationVariable])) {
+                        $result .= $this->components[$join->joinAssociationDeclaration->aliasIdentificationVariable];
                     }
                 }
             }