NP-250 Extract translations from intents file

UM/Decorators.py

@@ -197,3 +197,21 @@ def wrapper(instance, *args, **kwargs):
             return result.copy()
         return copy.copy(result)
     return wrapper
+
+def singleton(cls):
+    """
+    Function decorator that marks a class as being a Singleton, so that it gets a getInstance method.
+    note: I couldn't find a way to make typing-based PyCharm code-completion work with this properly.
+          If there is a way, please advise :)
+    """
+
+    cls.__instance = None
+
+    def getInstance(cls_):
+        if cls_.__instance is None:
+            cls_.__instance = cls_()
+        return cls_.__instance
+
+    cls.getInstance = classmethod(getInstance)
+
+    return cls