Apply signing commits, writing good cover letters and other kernel dev inspirations to translations

[RomuloOliveira]

In https://github.com/RomuloOliveira/commit-messages-guide/pull/73 there were additions on the why, use of personal language, and additional resources to those looking for PR/git related information (thanks @retpolanne for the contribution).

This issue is to map and apply the same to all other translations.