When Gitea answers 401, add the token's length and likely storage mistakes
(masked text, NAME=value, quotes, whitespace) to the message, without any
character of the token, so a wrongly stored secret can be recognised from
the log.
Task: MIL-005#8
The Publish wiki workflow now reads secrets.TOKEN_FOR_GITEA_WIKI ||
secrets.TOKEN_FOR_GITEA, so the existing token can publish the wiki when it
has write:repository. Update the missing-token message, the credentials and
troubleshooting guides, the README, the tests and the affected English
wiki pages with their Danish and Bahasa Malaysia translations.
Task: MIL-005#8