src/game/java/net/minecraft/client/resources/language/I18n.java

package net.minecraft.client.resources.language;

import java.util.IllegalFormatException;
import net.minecraft.locale.Language;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;

@OnlyIn(Dist.CLIENT)
public class I18n {
    private static volatile Language language = Language.getInstance();

    private I18n() {
    }

    static void setLanguage(Language p_118942_) {
        language = p_118942_;
    }

    public static String get(String p_118939_, Object... p_118940_) {
        String s = language.getOrDefault(p_118939_);

        try {
            return String.format(s, p_118940_);
        } catch (IllegalFormatException illegalformatexception) {
            return "Format error: " + s;
        }
    }

    public static boolean exists(String p_118937_) {
        return language.has(p_118937_);
    }
}