Add New Language Translation in koha LMS

Open the terminal and apply the following commands to add a new language translations

sudo su 

export KOHA_CONF=/etc/koha/sites/library/koha-conf.xml

export PERL5LIB=/usr/share/koha/lib

cd /usr/share/koha/misc/translator

Apply the following command to get the codes-list of available languages

koha-translate --list --available

Apply the following command to install the new language (e.g. Hindi)

perl translate install language_code

e.g.   perl translate install hi

Apply the command to get the list of installed languages

koha-translate --list

Activate the newly added language in the koha

Koha Administration ➤ System Preferences ➤ I18N/L10N 

language :- Check the box to enable in the Koha Staff Client

OPACLanguage :- Check the box to enable in the Koha OPAC

Check the box of languages for OPAC and Staff interface and save changes

Now you can find the name of language translations on the OPAC and staff interface at the bottom of left side. 

You can find the more language codes from the following link:-

https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes

References:- https://wiki.koha-community.org/wiki/Installation_of_additional_languages_for_OPAC_and_INTRANET_staff_client