remove unused Hyphenator dictionnary files from release zip, close #624

page render: convert lang to BCP 47 style, fix #614

W lang setting uses underscore separated locale definition whil HTML lang attribute should use BCP 47 format that uses hyphens.

this commit replace underscure by hyphens in lang attribute during page rendering

improve login() error handling, fix LDAP connection, close #605

login() code was a bit messy and hard to understand, so it was easiest to reorganize it than just fixing the bug.

comments: limit JWT validity to 24h if page edited since comment, close 

#604

comment conf store date modif of page

wrong authentication log a warning instead of an error, fix #575

Documentation special layout to allow back button when navigating anc…

…hors

update manual about noindex feature

fix typo in initTagify() JS func

typo occured during previous fix in c411715

fix Fs:folderflush() func non-file handling bug

This crashed when it encountered non-file elements

display API doc in info view

move external links to the bottom of left panel
add custom CSS for selector