[lang] Minor CSS tweaks stylistic improvements (#5128)
[lang] Minor CSS tweaks stylistic improvements (#5128)

Pluralizing paddings like this is a bit unidiomatic, and that "all" seems a bit redundant.

Cf. <https://github.com/koreader/koreader/pull/5127>.
NiLuJe/koreader,mihailim/koreader,Hzj-jie/koreader,koreader/koreader,pazos/koreader,Frenzie/koreader,NiLuJe/koreader,koreader/koreader,Markismus/koreader,poire-z/koreader,mwoz123/koreader,poire-z/koreader,Frenzie/koreader