Plugin time format does not read system settings in WP 4.4.2 correctly – example

Example with German standard setting output:

erstellt am: 18. Feb. 2016 | von: Management | Kategorie(n): Design
Last updated: Februar 23, 2016 at 15:17 pm

First row represents system setting correctly via template.
Second row ist wrong plugin output.

Any idea to fix this?

https://wordpress.org/plugins/last-updated-shortcode/