The easiest way to translate the plugin is by using the Loco Translate WordPress plugin. To use loco translate plugin, please see the steps below.
Step 2 – Go to Loco Translate > Plugins and click a plugin theme. Example: martfury–addons
Step 3 – Click New Language link.
If after you click New Language link, you see Template missing the warning. You only click Skip template link.
Step 4 – Choose your language and choose a location is in languages/plugins/. We recommend you don’t choose a location is in themes/martfury-addons/lang/, because after you update the theme all your custom files will be lost.
Step 5 – Click Start Translate button
Step 6 – Click Source Text and enter the text you want to translate in German translation.
Step 7 – Click Save button
Note: To update your language file when you updated the theme, you only click Sync button.