global: jinja2hacks deprecation and usage warning
- NOTE Adds deprecation warning for invenio.ext.jinja2hacks and all detected non-ascii strings usage in templates mainly coming from legacy (1.x) modules. (addresses #2862)
Reviewed-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>