[devtools/test] drop legacy cube i18n tests
test_i18ncube_legacy_layout() is droped and make others tests uses a new style
cube "cubicweb_i18ntestcube", so it doesn't depends on legacy cube machinery.
Document: cubicweb-doc
Title: CubicWeb Documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/python-cubicweb-documentation/html/index.html
Files: /usr/share/doc/python-cubicweb-documentation/html/*