Prevent the usage of filename:join, we can assume filenames are ok, because they come from the system. This prevents a lot of garbage being generated.
doc: Add `build:` tag to list of prefixes.
doc: Add `translations:` tag to list of prefixes.
doc: rename `translations:` to `translation:`.
mod_base: Modal html title in z.dialog

Modal title was rendered as text element.
The problem was that htmlentities wasn't parsed at all:
i.e. &eacute; -> &eacute; instead of é