Cyrillic flag names cause parser error

[zluque]

When i open my Inbox with mails having flags named in cyrillic letters a parser exception is thrown.
I added characters +#,& to the RegEx mask to fix this:
("flag", r'(\\|\$)?[a-zA-Z0-9\-_+#,&]+'),

modoboa-webmail/modoboa_webmail/lib/fetch_parser.py

Line 93 in 3acae80

("flag", r'(\\|\$)?[a-zA-Z0-9\-_]+'),