There are two active l10n-kf5 modules in KDE SVN (and also all the released ones). The two modules are:
trunk/l10n-kf5 for the unstable development branch
branches/stable/l10n-kf5 for the stable branch
The generic directory overview of a l10n-kf5 module is:
the templates directory: the place where the translation templates are stored.
the language directories (e.g. fr, de, en_GB) where the translations are stored.
the scripts directory: here are scripts needed for the l10n-kf5 module, however most of the scripts are not necessarily usable by translators.
the documentation directory: the place where the original English documentation is referred.