[Plone-i18n] update translations for Plone 5.1

[Vincent Fretin]

Hi,

I released plone.app.locales 5.1.2.

I resynced the plone domain and plone.app.caching,
so you have some messages to update in plone.app.locales master.

Leonardo, can you please take care of pushing an updated version to transifex?

For language teams that are using transifex, you need to have a language team leader to pull the changes to the plone.app.locales repository regularly otherwise your translations will never make it into a release.

Cheers

Vincent Fretin