Change "calendar" into "collection" when needed.

WARNING: the default folders storing calendars/addressbooks have been changed

radicale/__main__.py

@@ -111,7 +111,7 @@ def run():
     atexit.register(cleanup)
     radicale.log.LOGGER.info("Starting Radicale")
 
-    # Create calendar servers
+    # Create collection servers
     servers = []
     server_class = radicale.HTTPSServer if options.ssl else radicale.HTTPServer
     shutdown_program = threading.Event()

radicale/config.py

@@ -65,9 +65,9 @@ INITIAL_CONFIG = {
     "storage": {
         "type": "filesystem",
         "filesystem_folder":
-            os.path.expanduser("~/.config/radicale/calendars"),
+            os.path.expanduser("~/.config/radicale/collections"),
         "git_folder":
-            os.path.expanduser("~/.config/radicale/calendars")},
+            os.path.expanduser("~/.config/radicale/collections")},
     "logging": {
         "config": "/etc/radicale/logging",
         "debug": "False",