This reverts commit 49f6abb6035f97c0a98113e3aedf5d2db135bf63.
This commit includes a lot of unintendet reverts from f6044686a1768565bcf3d91489f1b080d64c8666 (Update Japanese holidays)
In follwing thread on KDE Bugzilla, Allen Winter seems to have merged very old code without confirming diff.
As a result, some updates I made in https://phabricator.kde.org/D5736 is reverted.
https://bugs.kde.org/show_bug.cgi?id=365241