How to deploy Custom Labels translation

 

1. Find file force-app/main/default/translations/<language_code>.translation-meta.xml
2. If you don't have this file create it.
3. You can find the language code here (ISO Language Code Table):  https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_objects_categorynodelocalization.htm
4. Use: 

   sfdx force:source:retrieve -p 
   "force-app/main/default/translations/
   <language_code>.translation-meta.xml"  -u   <Alias>

5. You will get a lot of extra data - choose only what you need
6. Done