Add more German vocabularies (#128)

german.yaml

@@ -6026,7 +6026,9 @@ vocabulary:
       - [dative,     Auge,     Augen ]
       - [accusative, Auge,     Augen ]
   - term: mal
-    definition: times
+    definition:
+      - (math) times
+      - alternative form of einmal
     audio: https://upload.wikimedia.org/wikipedia/commons/9/91/De-mal.ogg
   - term: sicher
     definition:

tests/test_vocabulary_parser.py

@@ -309,6 +309,16 @@ class TestVocabularyParser(unittest.TestCase):
                         'target_label': 'liefern'
                     }
                 ]
+            },
+            {
+                "words": ["mal", "einmal"],
+                "expected": [
+                    {
+                        'attributes': {'label': 'term related'},
+                        'source_label': 'einmal',
+                        'target_label': 'mal'
+                    }
+                ]
             }
         ]