What to do with `config.toml` when making a multilingual site?

Here Multilingual mode | Hugo it says

If you had more domains and languages, you would just create more config files. The standard config.toml is what Hugo will run as a default, but since we’re creating language-specific ones, you’ll need to specify each config file when running hugo server or just hugo before deploying.

So, for english and japanese versions I would have config_en.toml and config_ja.toml.

But what to do with config.toml? Remove?

I think, the docs should give an advice on this.

Yes, remove. The docs could be more clear about this, but the important piece of information here is that there is ONE config file per site.

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@askar You can rename config.toml to one of those versions that has the locale as prefix. You don’t need to have a file called config.toml, because the command --config="" allows you to specify a custom name for the config file.

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See: Multi-Language (each with it’s own content) in single tree,