You can edit all the languages that are supported by the app by following this guide. Please keep in mind that you need to have the store view with this language in your backend in order for the app to be synced.
From your SimiCart Dashboard, locate to App Builder > Language. You will see all the languages that are supported by the app.
To edit the translation text in each language, type your translations on the translation text fields and click Save.
In case you can't find the text that you want to translate in the app here, you can click Add New and type the exact phrase in the app and its translation text there.
After finishing setting up the language, click Save, your changes will be saved. Keep in mind that you can make your language changes anytime you want but you need to re-build the app for applying those changes on the app.