one page for all language

I have a site where default language in eenglish.
It is translate in other 5 differente languages.
I have 20 pages that contain non text but only images (gallery) so they do not need to be tranlsated each (20 x 5 pages = 100 tranlastion! )

Is there a solution?
Now, if i use example german language and i try to visit a non translated page, the language automatically switch to english. But this is not good!.. the user after must reset his languages everytime….
I would a flag or setting to avoid this. Or the possibility to add in the dropodown list , when i insert or modify a page, “All languages”.

Thanks

https://wordpress.org/plugins/polylang/