It seems that there is no implementation yet for language-specific archetypes.
However
To use language-specific archetypes for a language you can do hugo new -k en/blog content/en/blog/my-new-post.md
or hugo new -k sr/blog content/sr/blog/my-new-post.md
and by including content
in your path, the archetype will be interpolated and generated in the adequate folder. The archetypes
folder should be structured as follows (in your example):
archetypes
├── en
│ ├── blog.md
│ ├── default.md
│ ├── faq.md
│ ├── series.md
│ └── tags.md
└── sr
├── blog.md
├── default.md
├── faq.md
├── series.md
└── tags.md
It’s not elegant, but it works.