COPYING is missing non-expat license terms for some files and some files is also missing license terms. This is changes to makes it clearer and update. Fixes https://gitlab.freedesktop.org/fontconfig/fontconfig/-/issues/219
This adds the missing orth files for Ndebele (South) (nr), Northern Sotho (nso), Swati (ss) and Southern Sotho (st). It also fixes the Tswana (tn) orth file.