Plugin doesn't translate parts from other plugins in the site…Why ?

Hi

few things that related to few plugins.

It depends either these strings are static, you haven’t access to change them in your theme or plugin options. Or these strings are dynamic, you can modify theme in theme or plugin option.

Static strings: you can use Poedit or the Loco Translate plugin.
Dynamic strings: Polylang does the job.

Unfortunately it does not.
I’m using another plugin (WP-Members), whose strings are all present in the according language files (.po/.mo), but the sidebar widget of the plugin won’t show the (german) translations. Nor does the search form, which is another part of the plugin.
If I deactivate polylang, the strings are translated according to my wordpress installation language (which is german, too). Reactivating polylang, all strings remain english.
Can you give a hint why?

Could you give a link to the plugin WP Members?

@preuss-media
Please open your own topic to avoid to mix the answers between the Guyseo’request and yours, even if they seem similar.
Thanks.