doc: update news
doc: update po
Revert "doc: fix section header markup"

This reverts commit ab13c3e888b5887f3798928edbb71ea834eedf12.
Revert "doc: modify heading levels to solve "undefined label" issue"

This reverts commit 34f8133d6ada7a9d23f0120d1c9c280a32b16ab6.
doc: update Thanks list
doc: translate po