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Change the language

Open Settings › Appearance & Behavior › System Settings › Language and Region and choose a Language: The change applies as soon as you click Apply or OK, including the native menu bar; no restart needed. Text that hasn’t been translated yet stays in English. English and Simplified Chinese are complete; the other languages may have gaps. In settings.toml the option is locale under [appearance]:
Plugins are told the display language and can show their own text in it when they ship a translation.

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Search in your language

The settings search, Find Action and Search Everywhere match both the English names and the translated ones, so you can search in either.

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Date and time format

By default, dates in the Git log, Local History and blame annotations follow your operating system’s locale. To choose a format yourself, open Settings › Appearance & Behavior › System Settings › Date Formats and turn on Override system date and time format. The pattern uses dd, MM, MMM, yy and yyyy.

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Update source

When Update source is Automatic (the default), OpenIDEA downloads updates from the CNB mirror if the display language is Chinese, and from GitHub otherwise. See Install.

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Help translate

Translations live in the repository. See Text and localization to add or fix strings.