How do I translate the theme into my language?
The Easy Way: Translating using the Loco Translate Plugin
The Loco Translate Plugin let's you translate the theme via the WordPress dashboard without any need of an external editor. Install and run the "Loco Translate" plugin to translate everything in the site.
The Manual Way: Translating using Poedit.
The Poedit program lets you translate .po/.mo files on your computer.
1. Download and install the Poedit program.
Open the "default.po" file in your "lang" folder of your theme with poedit, and translate. When complete, you’ll want to save the file twice, as two separate files – a .po file and a .mo file. When you save the files, you must name them according to your language code.
Find a list of language codes at WordPress in your Language. As an example, the language code for English is en_EN, so you would save the translated files as en_EN.po first, then en_EN.mo. When that’s done, simply upload the files to your theme folder in the theme's /lang directory.
2. Tell WordPress which language to use.
Open your wp-config.php and change the language to match your language files. For example, if you’re using a French translation, you’ll need to add the fr_FR.po and fr_FR.mo files to your theme folder, then set your language in wp-config.php, like this:
define ('WPLANG', 'fr_FR');
By the way, your wp-config.php file is located in the main directory where all your core WordPress files are located.
Save your wp-config.php file, upload it to your WordPress installation, and you are ready to go.