attachments: fix links if only one language is present

[McShelby]

Discussed in #501

^{Originally posted by piotrzawadz March 13, 2023}
I've followed documentation:
https://mcshelby.github.io/hugo-theme-relearn/shortcodes/attachments/index.html

1. Create folder structure with md file:
   catalog1/catalog2/db_administration.md

2. Create folder:
   catalog1/catalog2/db_administration.files

• add several files into it

3. Then run hugo command to generate static files

4. Deploy them into github

Eventually files are properly displayed on the page generated from db_administration.md (styles work perfectly), however when I click attachment I receive:
"Woops. Looks like this page doesn't exist ¯_(ツ)_/¯."

The generated link is:
https:///catalog1/catalog2/db_administration/.files/configure_db_txt

I've noticed that when it is change it manually to:
https:///catalog1/catalog2/db_administration.files/configure_db_txt

the file can be open.

Therefore, it looks that / is somewhere added between db2_administration and .files. Is it a bug or should I change something in my code?

[McShelby]

@piotrzawadz: This bug is fixed in version 5.12.3