(cherry picked from commit ecc3dae2ac)
(cherry picked from commit c6c3fc6ace)
(cherry picked from commit 4833bd594a)
[I18N] in the home page replace GitHub with Forgejo
The english string that shows on the home page to encourage for
contribution no longer reference GitHub. But some translations still
do. In this context, and this context only, replace it with Forgejo
even though it may not be correct in some cases.
Refs: https://codeberg.org/forgejo/forgejo/pulls/450
(cherry picked from commit 71de77f5ae)
(cherry picked from commit 0b5195e4e4)
(cherry picked from commit 1252e83f8c)
