Reduce verbose locale output in -XshowSettings launcher option

Currently, the "-XshowSettings" launcher command prints all available locales, thus making the output very verbose by default and making it harder to see settings, e.g.

    available locales = , af, af_NA, af_ZA, af_ZA_#Latn, agq, agq_CM, agq_CM_#Latn,
        ak, ak_GH, ak_GH_#Latn, am, am_ET, am_ET_#Ethi, ann, ann_NG,
        ann_NG_#Latn, ar, ar_001, ar_AE, ar_BH, ar_DJ, ar_DZ, ar_EG,
        ar_EG_#Arab, ar_EH, ar_ER, ar_IL, ar_IQ, ar_JO, ar_KM, ar_KW,
        ar_LB, ar_LY, ar_MA, ar_MR, ar_OM, ar_PS, ar_QA, ar_SA,
        ar_SD, ar_SO, ar_SS, ar_SY, ar_TD, ar_TN, ar_YE, as,
        as_IN, as_IN_#Beng, asa, asa_TZ, asa_TZ_#Latn, ast, ast_ES, ast_ES_#Latn,
        az, az_AZ, az_AZ_#Cyrl, az_AZ_#Latn, az__#Cyrl, az__#Latn, bas, bas_CM,
        bas_CM_#Latn, be, be_BY, be_BY_#Cyrl, be__TARASK, bem, bem_ZM, bem_ZM_#Latn,
        bez, bez_TZ, bez_TZ_#Latn, bg, bg_BG, bg_BG_#Cyrl, bgc, bgc_IN,
        bgc_IN_#Deva, bho, bho_IN, bho_IN_#Deva, bm, bm_ML, bm_ML_#Latn, bn,
        bn_BD, bn_BD_#Beng, bn_IN, bo, bo_CN, bo_CN_#Tibt, bo_IN, br,
        br_FR, br_FR_#Latn, brx, brx_IN, brx_IN_#Deva, bs, bs_BA, bs_BA_#Cyrl,
        bs_BA_#Latn, bs__#Cyrl, bs__#Latn, ca, ca_AD, ca_ES, ca_ES_#Latn, ca_ES_VALENCIA,
        ca_FR, ca_IT, ccp, ccp_BD, ccp_BD_#Cakm, ccp_IN, ce, ce_RU,
        ce_RU_#Cyrl, ceb, ceb_PH, ceb_PH_#Latn, cgg, cgg_UG, cgg_UG_#Latn, chr,
        chr_US, chr_US_#Cher, ckb, ckb_IQ, ckb_IQ_#Arab, ckb_IR, cs, cs_CZ,
        cs_CZ_#Latn, cv, cv_RU, cv_RU_#Cyrl, cy, cy_GB, cy_GB_#Latn, da,
        da_DK, da_DK_#Latn, da_GL, dav, dav_KE, dav_KE_#Latn, de, de_AT,
        de_BE, de_CH, de_DE, de_DE_#Latn, de_IT, de_LI, de_LU, dje,
        dje_NE, dje_NE_#Latn, doi, doi_IN, doi_IN_#Deva, dsb, dsb_DE, dsb_DE_#Latn,
        dua, dua_CM, dua_CM_#Latn, dyo, dyo_SN, dyo_SN_#Latn, dz, dz_BT,
        dz_BT_#Tibt, ebu, ebu_KE, ebu_KE_#Latn, ee, ee_GH, ee_GH_#Latn, ee_TG,
        el, el_CY, el_GR, el_GR_#Grek, en, en_001, en_150, en_AE,
        en_AG, en_AI, en_AS, en_AT, en_AU, en_BB, en_BE, en_BI,
        en_BM, en_BS, en_BW, en_BZ, en_CA, en_CC, en_CH, en_CK,
        en_CM, en_CX, en_CY, en_DE, en_DG, en_DK, en_DM, en_ER,
        en_FI, en_FJ, en_FK, en_FM, en_GB, en_GD, en_GG, en_GH,
        en_GI, en_GM, en_GU, en_GY, en_HK, en_IE, en_IL, en_IM,
        en_IN, en_IO, en_JE, en_JM, en_KE, en_KI, en_KN, en_KY,
        en_LC, en_LR, en_LS, en_MG, en_MH, en_MO, en_MP, en_MS,
        en_MT, en_MU, en_MV, en_MW, en_MY, en_NA, en_NF, en_NG,
        en_NL, en_NR, en_NU, en_NZ, en_PG, en_PH, en_PK, en_PN,
        en_PR, en_PW, en_RW, en_SB, en_SC, en_SD, en_SE, en_SG,
        en_SH, en_SI, en_SL, en_SS, en_SX, en_SZ, en_TC, en_TK,
        en_TO, en_TT, en_TV, en_TZ, en_UG, en_UM, en_US, en_US_#Latn,
        en_US_POSIX, en_VC, en_VG, en_VI, en_VU, en_WS, en_ZA, en_ZM,
        en_ZW, eo, eo_001, eo_001_#Latn, es, es_419, es_AR, es_BO,
        es_BR, es_BZ, es_CL, es_CO, es_CR, es_CU, es_DO, es_EA,
        es_EC, es_ES, es_ES_#Latn, es_GQ, es_GT, es_HN, es_IC, es_MX,
        es_NI, es_PA, es_PE, es_PH, es_PR, es_PY, es_SV, es_US,
        es_UY, es_VE, et, et_EE, et_EE_#Latn, eu, eu_ES, eu_ES_#Latn,
        ewo, ewo_CM, ewo_CM_#Latn, fa, fa_AF, fa_IR, fa_IR_#Arab, ff,
        ff_BF_#Adlm, ff_BF_#Latn, ff_CM_#Adlm, ff_CM_#Latn, ff_GH_#Adlm, ff_GH_#Latn, ff_GM_#Adlm, ff_GM_#Latn,
        ff_GN, ff_GN_#Adlm, ff_GN_#Latn, ff_GW_#Adlm, ff_GW_#Latn, ff_LR_#Adlm, ff_LR_#Latn, ff_MR_#Adlm,
        ff_MR_#Latn, ff_NE_#Adlm, ff_NE_#Latn, ff_NG_#Adlm, ff_NG_#Latn, ff_SL_#Adlm, ff_SL_#Latn, ff_SN,
        ff_SN_#Adlm, ff_SN_#Latn, ff__#Adlm, ff__#Latn, fi, fi_FI, fi_FI_#Latn, fil,
        fil_PH, fil_PH_#Latn, fo, fo_DK, fo_FO, fo_FO_#Latn, fr, fr_BE,
        fr_BF, fr_BI, fr_BJ, fr_BL, fr_CA, fr_CD, fr_CF, fr_CG,
        fr_CH, fr_CI, fr_CM, fr_DJ, fr_DZ, fr_FR, fr_FR_#Latn, fr_GA,
        fr_GF, fr_GN, fr_GP, fr_GQ, fr_HT, fr_KM, fr_LU, fr_MA,
        fr_MC, fr_MF, fr_MG, fr_ML, fr_MQ, fr_MR, fr_MU, fr_NC,
        fr_NE, fr_PF, fr_PM, fr_RE, fr_RW, fr_SC, fr_SN, fr_SY,
        fr_TD, fr_TG, fr_TN, fr_VU, fr_WF, fr_YT, frr, frr_DE,
        frr_DE_#Latn, fur, fur_IT, fur_IT_#Latn, fy, fy_NL, fy_NL_#Latn, ga,
        ga_GB, ga_IE, ga_IE_#Latn, gd, gd_GB, gd_GB_#Latn, gl, gl_ES,
        gl_ES_#Latn, gsw, gsw_CH, gsw_CH_#Latn, gsw_FR, gsw_LI, gu, gu_IN,
        gu_IN_#Gujr, guz, guz_KE, guz_KE_#Latn, gv, gv_IM, gv_IM_#Latn, ha,
        ha_GH, ha_NE, ha_NG, ha_NG_#Latn, haw, haw_US, haw_US_#Latn, he,
        he_IL, he_IL_#Hebr, hi, hi_IN, hi_IN_#Deva, hi_IN_#Latn, hi__#Latn, hr,
        hr_BA, hr_HR, hr_HR_#Latn, hsb, hsb_DE, hsb_DE_#Latn, hu, hu_HU,
        hu_HU_#Latn, hy, hy_AM, hy_AM_#Armn, ia, ia_001, ia_001_#Latn, id,
        id_ID, id_ID_#Latn, ig, ig_NG, ig_NG_#Latn, ii, ii_CN, ii_CN_#Yiii,
        is, is_IS, is_IS_#Latn, it, it_CH, it_IT, it_IT_#Latn, it_SM,
        it_VA, ja, ja_JP, ja_JP_#Jpan, ja_JP_JP_#u-ca-japanese, jgo, jgo_CM, jgo_CM_#Latn,
        jmc, jmc_TZ, jmc_TZ_#Latn, jv, jv_ID, jv_ID_#Latn, ka, ka_GE,
        ka_GE_#Geor, kab, kab_DZ, kab_DZ_#Latn, kam, kam_KE, kam_KE_#Latn, kde,
        kde_TZ, kde_TZ_#Latn, kea, kea_CV, kea_CV_#Latn, kgp, kgp_BR, kgp_BR_#Latn,
        khq, khq_ML, khq_ML_#Latn, ki, ki_KE, ki_KE_#Latn, kk, kk_KZ,
        kk_KZ_#Cyrl, kkj, kkj_CM, kkj_CM_#Latn, kl, kl_GL, kl_GL_#Latn, kln,
        kln_KE, kln_KE_#Latn, km, km_KH, km_KH_#Khmr, kn, kn_IN, kn_IN_#Knda,
        ko, ko_KP, ko_KR, ko_KR_#Kore, kok, kok_IN, kok_IN_#Deva, ks,
        ks_IN, ks_IN_#Arab, ks_IN_#Deva, ks__#Arab, ks__#Deva, ksb, ksb_TZ, ksb_TZ_#Latn,
        ksf, ksf_CM, ksf_CM_#Latn, ksh, ksh_DE, ksh_DE_#Latn, ku, ku_TR,
        ku_TR_#Latn, kw, kw_GB, kw_GB_#Latn, ky, ky_KG, ky_KG_#Cyrl, lag,
        lag_TZ, lag_TZ_#Latn, lb, lb_LU, lb_LU_#Latn, lg, lg_UG, lg_UG_#Latn,
        lkt, lkt_US, lkt_US_#Latn, ln, ln_AO, ln_CD, ln_CD_#Latn, ln_CF,
        ln_CG, lo, lo_LA, lo_LA_#Laoo, lrc, lrc_IQ, lrc_IR, lrc_IR_#Arab,
        lt, lt_LT, lt_LT_#Latn, lu, lu_CD, lu_CD_#Latn, luo, luo_KE,
        luo_KE_#Latn, luy, luy_KE, luy_KE_#Latn, lv, lv_LV, lv_LV_#Latn, mai,
        mai_IN, mai_IN_#Deva, mas, mas_KE, mas_KE_#Latn, mas_TZ, mdf, mdf_RU,
        mdf_RU_#Cyrl, mer, mer_KE, mer_KE_#Latn, mfe, mfe_MU, mfe_MU_#Latn, mg,
        mg_MG, mg_MG_#Latn, mgh, mgh_MZ, mgh_MZ_#Latn, mgo, mgo_CM, mgo_CM_#Latn,
        mi, mi_NZ, mi_NZ_#Latn, mk, mk_MK, mk_MK_#Cyrl, ml, ml_IN,
        ml_IN_#Mlym, mn, mn_MN, mn_MN_#Cyrl, mni, mni_IN, mni_IN_#Beng, mni__#Beng,
        mr, mr_IN, mr_IN_#Deva, ms, ms_BN, ms_ID, ms_MY, ms_MY_#Latn,
        ms_SG, mt, mt_MT, mt_MT_#Latn, mua, mua_CM, mua_CM_#Latn, my,
        my_MM, my_MM_#Mymr, mzn, mzn_IR, mzn_IR_#Arab, naq, naq_NA, naq_NA_#Latn,
        nb, nb_NO, nb_NO_#Latn, nb_SJ, nd, nd_ZW, nd_ZW_#Latn, nds,
        nds_DE, nds_DE_#Latn, nds_NL, ne, ne_IN, ne_NP, ne_NP_#Deva, nl,
        nl_AW, nl_BE, nl_BQ, nl_CW, nl_NL, nl_NL_#Latn, nl_SR, nl_SX,
        nmg, nmg_CM, nmg_CM_#Latn, nn, nn_NO, nn_NO_#Latn, nnh, nnh_CM,
        nnh_CM_#Latn, no, no_NO, no_NO_#Latn, no_NO_NY, nus, nus_SS, nus_SS_#Latn,
        nyn, nyn_UG, nyn_UG_#Latn, oc, oc_ES, oc_ES_#Latn, oc_FR, oc_FR_#Latn,
        om, om_ET, om_ET_#Latn, om_KE, or, or_IN, or_IN_#Orya, os,
        os_GE, os_GE_#Cyrl, os_RU, pa, pa_IN, pa_IN_#Guru, pa_PK, pa_PK_#Arab,
        pa__#Arab, pa__#Guru, pcm, pcm_NG, pcm_NG_#Latn, pis, pis_SB, pis_SB_#Latn,
        pl, pl_PL, pl_PL_#Latn, ps, ps_AF, ps_AF_#Arab, ps_PK, pt,
        pt_AO, pt_BR, pt_BR_#Latn, pt_CH, pt_CV, pt_GQ, pt_GW, pt_LU,
        pt_MO, pt_MZ, pt_PT, pt_ST, pt_TL, qu, qu_BO, qu_EC,
        qu_PE, qu_PE_#Latn, raj, raj_IN, raj_IN_#Deva, rm, rm_CH, rm_CH_#Latn,
        rn, rn_BI, rn_BI_#Latn, ro, ro_MD, ro_RO, ro_RO_#Latn, rof,
        rof_TZ, rof_TZ_#Latn, ru, ru_BY, ru_KG, ru_KZ, ru_MD, ru_RU,
        ru_RU_#Cyrl, ru_UA, rw, rw_RW, rw_RW_#Latn, rwk, rwk_TZ, rwk_TZ_#Latn,
        sa, sa_IN, sa_IN_#Deva, sah, sah_RU, sah_RU_#Cyrl, saq, saq_KE,
        saq_KE_#Latn, sat, sat_IN, sat_IN_#Olck, sat__#Olck, sbp, sbp_TZ, sbp_TZ_#Latn,
        sc, sc_IT, sc_IT_#Latn, sd, sd_IN, sd_IN_#Deva, sd_PK, sd_PK_#Arab,
        sd__#Arab, sd__#Deva, se, se_FI, se_NO, se_NO_#Latn, se_SE, seh,
        seh_MZ, seh_MZ_#Latn, ses, ses_ML, ses_ML_#Latn, sg, sg_CF, sg_CF_#Latn,
        shi, shi_MA, shi_MA_#Latn, shi_MA_#Tfng, shi__#Latn, shi__#Tfng, si, si_LK,
        si_LK_#Sinh, sk, sk_SK, sk_SK_#Latn, sl, sl_SI, sl_SI_#Latn, smn,
        smn_FI, smn_FI_#Latn, sms, sms_FI, sms_FI_#Latn, sn, sn_ZW, sn_ZW_#Latn,
        so, so_DJ, so_ET, so_KE, so_SO, so_SO_#Latn, sq, sq_AL,
        sq_AL_#Latn, sq_MK, sq_XK, sr, sr_BA, sr_BA_#Cyrl, sr_BA_#Latn, sr_CS,
        sr_ME, sr_ME_#Cyrl, sr_ME_#Latn, sr_RS, sr_RS_#Cyrl, sr_RS_#Latn, sr_XK_#Cyrl, sr_XK_#Latn,
        sr__#Cyrl, sr__#Latn, su, su_ID, su_ID_#Latn, su__#Latn, sv, sv_AX,
        sv_FI, sv_SE, sv_SE_#Latn, sw, sw_CD, sw_KE, sw_TZ, sw_TZ_#Latn,
        sw_UG, ta, ta_IN, ta_IN_#Taml, ta_LK, ta_MY, ta_SG, te,
        te_IN, te_IN_#Telu, teo, teo_KE, teo_UG, teo_UG_#Latn, tg, tg_TJ,
        tg_TJ_#Cyrl, th, th_TH, th_TH_#Thai, th_TH_TH_#u-nu-thai, ti, ti_ER, ti_ET,
        ti_ET_#Ethi, tk, tk_TM, tk_TM_#Latn, to, to_TO, to_TO_#Latn, tok,
        tok_001, tok_001_#Latn, tr, tr_CY, tr_TR, tr_TR_#Latn, tt, tt_RU,
        tt_RU_#Cyrl, twq, twq_NE, twq_NE_#Latn, tzm, tzm_MA, tzm_MA_#Latn, ug,
        ug_CN, ug_CN_#Arab, uk, uk_UA, uk_UA_#Cyrl, ur, ur_IN, ur_PK,
        ur_PK_#Arab, uz, uz_AF, uz_AF_#Arab, uz_UZ, uz_UZ_#Cyrl, uz_UZ_#Latn, uz__#Arab,
        uz__#Cyrl, uz__#Latn, vai, vai_LR, vai_LR_#Latn, vai_LR_#Vaii, vai__#Latn, vai__#Vaii,
        vi, vi_VN, vi_VN_#Latn, vun, vun_TZ, vun_TZ_#Latn, wae, wae_CH,
        wae_CH_#Latn, wo, wo_SN, wo_SN_#Latn, xh, xh_ZA, xh_ZA_#Latn, xog,
        xog_UG, xog_UG_#Latn, yav, yav_CM, yav_CM_#Latn, yi, yi_001, yi_001_#Hebr,
        yo, yo_BJ, yo_NG, yo_NG_#Latn, yrl, yrl_BR, yrl_BR_#Latn, yrl_CO,
        yrl_VE, yue, yue_CN, yue_CN_#Hans, yue_HK, yue_HK_#Hant, yue__#Hans, yue__#Hant,
        zgh, zgh_MA, zgh_MA_#Tfng, zh, zh_CN, zh_CN_#Hans, zh_HK, zh_HK_#Hans,
        zh_HK_#Hant, zh_MO, zh_MO_#Hans, zh_MO_#Hant, zh_SG, zh_SG_#Hans, zh_TW, zh_TW_#Hant,
        zh__#Hans, zh__#Hant, zu, zu_ZA, zu_ZA_#Latn
 
This level of detail should be printed only if the -XshowSettings:locale subcommand is specified (we can continue to print all other locale details with -XshowSettings)