Language sub-types (RFC 3866) are tricky to handle in a
schema-aware LDAP client.
For which attributes are you using this?
We are using language tags (lang-el-gr, lang-en-us) for:
cn, o, ou, title, sn
phpLDAPadmin handles them well up to v1.1.0.7: Tagged
attributes are displayed correctly and even updates are
successful.
Since v1.2.x.x it cannot handle them and tagged attributes
cannot even show up. We only get a series of: "phpLDAPadmin
doesnt support RFC3866" errors, one per each tagged
attribute.
So all 1.2 versions are practically unusable in our use
case.