The Server Language setting
The languages Ticket King supports, picked once at the server level.
Settings, "Server Settings & Logging", Server Language.
This sets the language Ticket King uses in your server. Every bot message (welcome embeds, log embeds, error replies, slash command responses, DM notifications) uses the configured language.
Default
English. This is also the base language that every other language is translated from.
How to change
Click the Server Language dropdown.
Pick from the list of supported languages.
Settings save automatically.
Changes apply to all future bot messages. Messages that were already posted are not retranslated.

Supported languages
Many of these are also supported natively by Discord. The rest are specific to Ticket King.
Spotted a translation problem?
If a translation looks wrong or a string still shows in English, let us know so we can fix it. See Reporting translation issues.
Related
How the bot picks a languageReporting translation issuesLast updated
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