You want to translate your site to another language but you can not do it with the theme part. So what should you do? Loco Translate plugin is the best solution for you.
Step 1: Navigate to Plugins > Add New.
Step 2: Find Loco Translate in search plugins box. Install and active this plugin.
Step 3: Loco Translate plugin has worked in your site already. Find Loco Translate the left column of the admin screen.
Step 4: Click Create new template and follow the instructions.
Step 5: After creating the template сhoose a language you want and choose a location. The recommended location is Loco’s protected folder under “wp-content/languages/loco/” which is safe from automatic updates . If this folder doesn’t exist you may need to create it and ensure it has the correct permissions. After choosing location, please hit Start translating button.
Step 6: Find the text you want to translate in Filter translations box then the text you choose will appear in Source text box. You can type the translation version in below box. After translating hit Save button.
Step 7: Do not forget to navigate to Setting > General and change Site language to the language you choose to translate to.