Hi Simone,
You’ll need to translate the plugin using po edit. Are you familiar with translating plugins?
Additionally, you can use our read more filter to alter the text into your language.
The filter is timeline_express_read_more_text
It would probably be best to translate the plugin into your language, so when you switch languages all of our strings translate as well.
You can hop onto glotpress and help translate things into your language, so anyone else using the same language will also receive the translations.
https://translate.wordpress.org/projects/wp-plugins/timeline-express
If you submit translations there, I would need to get you approved as a translator so you can post and approve translations there for us.
Thanks!
Evan