use appdirs to define path to polyglot data

app/__init__.py

@@ -1,2 +1,10 @@
+import os
+from appdirs import user_data_dir
+
+# override polyglot path
+import polyglot
+polyglot.polyglot_path = os.path.join(user_data_dir(appname="LibreTranslate", appauthor="uav4geo"), "polyglot_data")
+
+
 from .main import main
 from .manage import manage

requirements.txt

@@ -9,3 +9,4 @@ pyicu==2.6
 pycld2==0.41
 morfessor==2.0.6
 polyglot==16.7.4
+appdirs==1.4.4