Install translated manuals

With at least one manual now fully translated, we need to install it to
the right place in both the Makefile and meson.build.

For the former use a similar loop as is in use for the MO files. For the
latter we sadly need to place the manual manually using install_data()
because meson only supports localized manuals natively starting at
0.58.0, a version that is only about two months old.

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