Add localizations to UI tests target (#118)

Tools/SwiftGen/Templates/Strings/structured-swift5-element.stencil

@@ -87,7 +87,7 @@ extension {{enumName}} {
   }
 
   private static func trIn(_ language: String, _ table: String, _ key: String, _ args: CVarArg...) -> String {
-    guard let bundle = Bundle.lprojBundle(for: language) else {
+    guard let bundle = Bundle(for: BundleToken.self).lprojBundle(for: language) else {
       // no translations for the desired language
       return key
     }
@@ -96,6 +96,8 @@ extension {{enumName}} {
   }
 }
 
+private final class BundleToken {}
+
 {% else %}
 // No string found
 {% endif %}