5.5.0.1

Updated a few issues that were brought to my attention from Thomas
Meyer. These changes regarded the tag, archive, category and 404 files.
Thomas was also kind enough to provide the German translation to
WP-Forge. Also corrected an issue with the reveal modal background not
filling the page #6140
Revert "5.5.0.1"

This reverts commit 0ebeaa9682e52ce6127a4d0e94a4c9867d2ba291.
Revert "Revert "5.5.0.1""

This reverts commit 57637f4b3d56fbb098065ce66d570cb01d4ab6fd.
5.5.0.1

Added credit to Thomas Meyer for German translation