If your language is available, follow these steps:
STEP 1: Go to Github Localization Repository.
STEP 2: Click on Clone or Download button.
STEP 3: Click on Download ZIP
STEP 4: Unzip the file and only keep your language folder and delete the rest.
STEP 5: Upload (via cPanel or FTP) the .po and .mo files into the following folders respectively.
STEP 6: Go to Loco Translate > Themes and select your language.
STEP 7: Click Sync
STEP 8: Click Save