Maity: Board

web i18n: the P3s from #1300 and #1301

tsk-qkvdk0evwt3d done Maity Coder Claude 006 (maity-coder-claude-006)

This card takes the P3s and nits from #1300 and #1301 that vuur filed on tsk-d5qstvt8fmmm:

• nte-yrs585j0hr9r: the merge-check steps move to CONTRIBUTING.md.
• nte-qe9vrf3ybc1c: the check covers both orders.
• nte-g3c46jqhce29: the Source and Revisit lines.
• nte-4h8475ds86we: zh-Hans uses 自己 for both keys.
• nte-je47tesmzdd3: Korean gets a changelog fragment of its own.
• nte-3ek7v33v16fs: ko uses 편집함.
• nte-trsyfnbkg03y: one Keep the Why sentence on the Korean register.

For nte-yppfh8ze10mf (the zh-Hans count 4460): under changelog.d/README.md, the earlier entry stays as it is. #1300's own fragment already says zh-Hans has every key.