Phosh still in English, after switching languages

[firefox-58]

... Are there localisation packages I have to install to get the interface localized, or how to I achieve full localisation?

Thanks!

Johannes

From the forum:

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small note: is something wrong with the location?

I change the following for each img:

locale -a
C
POSIX

localectl
  System Locale: LANG=de_DE.UTF-8
      VC Keymap: n/a
      X11 Layout: n/a

localectl set-keymap de
localectl set-x11-keymap de

sudo nano /etc/locale.gen

#de_CH ISO-8859-1
de_DE.UTF-8 UTF-8 
#de_DE ISO-8859-1

sudo locale-gen

sudo nano /etc/locale.conf

LANG=de_DE.utf8
LC_CTYPE="de_DE.utf8"
LC_NUMERIC=de_DE.UTF-8
LC_TIME=de_DE.UTF-8
LC_COLLATE="de_DE.utf8"
LC_MONETARY=de_DE.UTF-8
LC_MESSAGES="de_DE.utf8"
LC_PAPER=de_DE.UTF-8
LC_NAME=de_DE.UTF-8
LC_ADDRESS=de_DE.UTF-8
LC_TELEPHONE=de_DE.UTF-8
LC_MEASUREMENT=de_DE.UTF-8
LC_IDENTIFICATION=de_DE.UTF-8
LC_ALL=

Then everything can be changed to my language in Region & Language settings

locale -a
C
de_DE.utf8
POSIX