Switched UI Label to use localized strings.

src/dawn/assert/assert.hpp

@@ -50,6 +50,17 @@ static inline void assertTrue(bool_t x) {}
    * Asserts a function as being deprecated.
    */
   void assertDeprecated();
+
+  /**
+   * Asserts that a given map has a key.
+   * 
+   * @param map Map to check.
+   * @param key Key to try and assert exists.
+   */
+  template<typename K, typename V>
+  void assertMapHasKey(std::map<K,V> map, K key) {
+    assertTrue(map.find(key) != map.end());
+  }
 #else
 
   #define assertTrue assert