[server] make `test_bfss_fs_importing_transparency` less verbose on failure Dumping the whole content of a file on failure is a bit annoying. We only print the bad version here (it's usually the file path).

[entity] drop redundant cache update This ``cw_attr_cache`` update is redundant, ``_cw_update_attr_cache`` already do this step.

[cw-ctl] silence msgcat and msgfmt (closes #2527594)

Added tag cubicweb-debian-version-3.15.7-1 for changeset c5400558f370

Added tag cubicweb-version-3.15.7 for changeset d8916cee7b70

prepare 3.15.7