consistent wording for upload options --> folder

res/values/strings.xml

@@ -71,8 +71,8 @@
     <string name="uploader_error_message_source_file_not_copied">An error occurred while copying the file to a temporary folder. Please try to send again.</string>
     <string name="uploader_upload_files_behaviour">Upload option:</string>
     <string name="uploader_upload_files_behaviour_move_to_nextcloud_folder">Move file to Nextcloud folder</string>
-    <string name="uploader_upload_files_behaviour_only_upload">Keep file in source directory</string>
-    <string name="uploader_upload_files_behaviour_upload_and_delete_from_source">Delete file from source directory</string>
+    <string name="uploader_upload_files_behaviour_only_upload">Keep file in source folder</string>
+    <string name="uploader_upload_files_behaviour_upload_and_delete_from_source">Delete file from source folder</string>
     <string name="file_list_seconds_ago">seconds ago</string>
     <string name="file_list_empty">Nothing in here. Upload something!</string>
     <string name="file_list_loading">Loading&#8230;</string>