[i18n-en] Translating docs to Japanese

[rajveer43]

Hi!

Let's bring the documentation to all the Japanese-speaking community 🌐

Who would want to translate? Please follow the 🤗 TRANSLATING guide. Here is a list of the files ready for translation. Let us know in this issue if you'd like to translate any, and we'll add your name to the list.

Some notes:

• Please translate using an informal tone (imagine you are talking with a friend about transformers 🤗).
• Please translate in a gender-neutral way.
• Add your translations to the folder called ja inside the source folder.
• Register your translation in ja/_toctree.yml; please follow the order of the English version.
• Once you're finished, open a pull request and tag this issue by including #issue-number in the description, where issue-number is the number of this issue. Please ping @stevhliu and @MKhalusova for review.
• 🙋 If you'd like others to help you with the translation, you can also post in the 🤗 forums.

Model doc section

• deit.md Add models from deit #28302
• deplot.md Add models from deit #28302
• deta.md Add models from deit #28302
• detr.md Add models from deit #28302
• dialogpt.md
• dinat.md
• dinov2.mdAdd dinov2 model #29272
• distilbert.md

Keep on adding more as you go 🔥

[rajveer43]

@stevhliu would you add the more models here in the list so other can look at this issue and collaborate?

[rajveer43]

@stevhliu, @ArthurZucker would you add the more models here in the list so other can look at this issue and collaborate?