Magento2 - Translations

app/i18n/slovak/sk_SK/sk_SK.csv

"Search Terms","Vyhľadávanie"

app/i18n/slovak/sk_SK/language.xml

<?xml version="1.0"?>
<language xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/Language/package.xsd">
    <code>sk_SK</code>
    <vendor>slovak</vendor>
    <package>sk_sk</package>
</language>

app/i18n/slovak/sk_SK/registration.php

<?php
    \Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::LANGUAGE,
    'slovak_sk_sk',
    __DIR__
    );

Clean cache

php bin/magento cache:clean && php bin/magento cache:flush && sudo chmod 777 var -R && sudo chmod 777 pub -R

Deploy static content

 php bin/magento setup:static-content:deploy -f