How To Add Custom Translation Under Fluent In The PDF JS Viewer?

[chitgoks]

Attach (recommended) or Link to PDF file here:

Configuration:

• Web browser and its version: Chrome 123.0.6312.105
• Operating system and its version: Mac OSX Sonoma 14.3.1
• PDF.js version: 4.0.379'
• Is a browser extension: No

This is more of a question if it is possible or not (if not, then ill create a feature request) or what I could be doing wrong if one should be able to add custom translations. Back then in webL10n, i just add my own locale property language files in a different folder

e.g.

/custom-folder/locale/en.properties , de.properties, locale.properties (content is same format as viewer's locale.properties).

and then add another tag in the html file
<link rel="resource" type="application/l10n" href="../web/locale/locale.properties"/>

now, in v4, im struggling to find out how to. when i add
<link rel="resource" type="application/l10n" href="locale/locale.json"/>

before the link l10n tag of pdf and the ftl files are in a custom folder, thee translations of even pdf.js do not work.

If i do not place my add-on < link > tag or after the < link> tag l10n of pdf.js, it works ok.

but if i try to get the translation in the custom ftl file by PDFViewerApplication.l10n.get(keyname), it is undefined.

Steps to reproduce the problem:

1. add a custom locale folder and add this other link tag <link rel="resource" type="application/l10n" href="custom-locale/locale.json"/>
2. locale.json contains {
   "de": "de.ftl",
   "en": "en.ftl",
   "en-us": "en.ftl"
   }
3. reload pdf.js

What is the expected behavior? (add screenshot)
Expected behavior is that it should load all the translations even if there are 2 link tags of locale.json pointing to differetn paths.

What went wrong? (add screenshot)
Even the translations of pdf.js do not work after i add the tag.

Thoughts?

[chitgoks]

I will open a feature request for this. seems only 1 link tag is retrieved by viewer.mjs