Merge branch 'front-corpus-props' into 'master'

Add a comment to specify DEFAULT_CORPUS_ATTRS IN the frontend

See merge request !1017

arkindex/project/default_corpus.py

@@ -2,6 +2,7 @@
 from arkindex_common.enums import TranscriptionType
 
 
+# If you edit default types, please update 'DEFAULT_CORPUS_ATTRS' config value in the frontend (at js/config.js)
 DEFAULT_CORPUS_TYPES = [
     {
         'slug': 'folder',