Send source language in request to improve translation result

deepl_api.py

@@ -7,7 +7,7 @@ def read_file(path):
     return data
 
 def get_translation(text, target_lang):
-    args = {"auth_key": auth_key, "text": text, "target_lang": target_lang}
+    args = {"auth_key": auth_key, "text": text, "target_lang": target_lang, "source_lang": "DE"}
     r = requests.get("https://api.deepl.com/v2/translate", params = args)
     return r.text