PrestaShop 1.6.x. How to display flags in the language switcher

Download the flags

1. Make sure all the languages have flags in Localization -> Languages section.
2. Go to www.famfamfam.com and download the icons: 
3. Open the downloaded zip file and extract the icons you need.
4. In your PrestaShop admin panel go to Localization -> Languages section: 
5. Click the Edit button for the language you want to add a flag: 
6. Upload the country flag from your computer: 
7. Click the Save button to confirm the action.

Display a flag in the language switcher on the front end

1. Open the  themes/themeXXXX/modules/blocklanguages/blocklanguages.tpl with some code editor: 
2. Insert the following code before {$language.name|regex_replace:"/\s\(.*\)$/":""} twice on lines 7 and 22 (approximately):

it will look like:

Save the changes in the file and re-upload it to the server.

Hopefully, this tutorial was helpful for you.