[i18n] Add context for calibre configuration type (#8909)
[i18n] Add context for calibre configuration type (#8909)

`Manual` could mean several things, most notably some kind of documentation and something you do by hand.

The added context is partially to aid translators and partially to preclude potential collisions in the future.

Cf. <https://github.com/koreader/koreader-translations/pull/138>.
koreader/koreader,NiLuJe/koreader,Frenzie/koreader,poire-z/koreader,NiLuJe/koreader,koreader/koreader,Frenzie/koreader,poire-z/koreader