I never got this to work. But it essentially, theoretically, switches at random the language of Minecraft. The code is provided as-is. License: CC0-1.0

troubleshootLocale.java

   List<String> languageCountryCodes = new ArrayList<>();
        Collections.addAll(languageCountryCodes,
                "af_za", "ara_sa", "ast_es", "aze_az", "bak_ru", "bar_de", "bel_by", "bul_bg", "bre_fr", "qbr_nl",
                "bos_ba", "cat_es", "ces_cz", "cym_gb", "dan_dk", "bar_at", "gsw_ch", "deu_de", "ell_gr", "eng_au",
                "eng_ca", "eng_gb", "eng_nz", "qpe", "eng_qabs_gb", "en_ud", "epo", "spa_ar", "spa_cl", "spa_ec",
                "spa_es", "spa_mx", "spa_uy", "spa_ve", "spa_es_an", "est_ee", "eus_es", "fas_ir", "fin_fi", "fil_ph",
                "fao_fo", "fra_ca", "fra_fr", "fra_de", "fur_it", "fry_nl", "gle_ie", "gla_gb", "glg_es", "haw_us",
                "heb_il", "hin_in", "hrv_hr", "hun_hu", "hye_am", "id_id", "ibo_ng", "is_is", "qis", "ita_it", "jpn_jp",
                "jbo", "kat_ge", "kaz_kz", "kan_in", "kor_kr", "ksh_de", "kw_gb", "lat_va", "ltz_lu", "lim_nl", "lmo_it",
                "lao_la", "qll", "lit_lt", "lav_lv", "lzh", "mkd_mk", "mon_mn", "zlm_my", "mlt_mt", "nhe_mx", "vmf_de",
                "msa_my", "mlg_mg", "mar_in", "nld_be", "nld_nl", "nno_no", "nob_no", "quc_latn_gt", "pol_pl", "por_br",
                "por_pt", "qya", "ro_ro", "qpr", "rus_ru", "srp_latn_rs", "srp_cyrl_rs", "swe_se", "slk_sk", "slv_si",
                "som_so", "sqi_al", "ckb_ir", "sr_sp", "swa_ke", "swh_tz", "tam_in", "tha_th", "tgk_tj", "uig_cn",
                "ukr_ua", "urd_pk", "uzb_uz", "ven_za", "cymr", "xho_za", "yor_ng", "yue_hk", "zho_hans_cn", "zho_hant_hk",
                "zho_hant_tw");

        // Shuffle the list
        Collections.shuffle(languageCountryCodes);

        // Print one code at a time
        for (String code : languageCountryCodes) {
            LanguageManager languageManager = new LanguageManager(code);
            languageManager.onResourceManagerReload(TroubleshootingMod.getResourceManager());
            System.out.println(Minecraft.getInstance().getLocale());
            System.out.println(code);
            break; // Exit the loop after printing one code
        }