Re: Language of applications are not translated if the default language is changed

[john doe <johndoe65534@mail.com>]

On 12/26/2017 2:27 PM, Greg Wooledge wrote:
> On Sun, Dec 24, 2017 at 08:27:20AM +0100, Andre Majorel wrote:
> > On 2017-12-23 19:21 +0100, john doe wrote:
> >
> > > I have install Debian 9 using as the default language 'C'.
> > > I want to add some new languages, and for this I do 'dpkg-reconfigure
> > > locales'.
> > > I'm currently using Gnome and Mate.
> > >
> > > How can I add support for those new languages so all
> > > applications will be translated in the desired language (using
> > > command line is prefered)?
> >
> > Have you tried setting LC_ALL appropriately (eg LC_ALL=fr_FR) in
> > your .profile then logging out & in again ?
>
> Do not use LC_ALL for this purpose.  It should be reserved for emergency
> overrides on a single command basis.
>
> Use the LANG variable to set your default locale and character set.
>
> <https://wiki.debian.org/Locale> describes the basic concepts and
> procedures for selecting your locale.
>
> In order to receive output in your preferred language, each application
> needs to have been configured for localization *and* have a translation
> mapping for your language.  The more common/popular a program is, the
> more likely this is to be true, at least for the more common languages.

Thank you for this,

I guess what I'm asking is:

When I install Debian, at the beginning, I select language 'a' and 
proceed with installation.
The installed system is properly set to language 'a' (desktop manager, 
Firefox, Thunderbird, Libreoffice, dictionaries  ...).

In addition to language 'a', I want to add support for language 'b' so 
the user could choose between language 'a' or 'b'.
Doing 'dpkg-reconfigure locales' selecting language 'a' and 'b' is not 
enough  for Firefox, Thunderbird to be translated into language 'b'..
In console mode I can change the language using 'LANG*'.
What should I do to translate Firefox and Thunderbird to language 'b'?

--
John Doe