I've prepared stats from Rouncube localization directory. Currently we're close to 0.2-stable release, so please use out translation service at http://translator.roundcube.net to update your language translation. Numbers in brackets represents the count of labels/messages waiting for translation. Translated files should be sent to 'dev' mailing list or to trac (http://trac.roundcube.net).
ar_SA: 97.83% (7) az_AZ: 97.83% (7) bg_BG: 97.52% (8) bs_BA: 65.01% (113) ca_ES: 85.13% (48) cs_CZ: 92.56% (24) cy_GB: 96.59% (11) da_DK: 91.02% (29) de_CH: 100.00% (0) de_DE: 100.00% (0) el_GR: 71.82% (91) en_GB: 97.21% (9) en_US: 100.00% (0) eo: 85.13% (48) es_ES: 85.13% (48) et_EE: 98.76% (4) eu_ES: 86.37% (44) fa: 84.21% (51) fi_FI: 96.59% (11) fr_FR: 98.76% (4) ga_IE: 66.56% (108) gl_ES: 96.59% (11) he_IL: 97.83% (7) hi_IN: 66.56% (108) hr_HR: 98.45% (5) hu_HU: 85.13% (48) hy_AM: 71.82% (91) id_ID: 86.37% (44) is_IS: 58.51% (134) it_IT: 97.83% (7) ja_JP: 96.90% (10) ka_GE: 71.82% (91) ko_KR: 71.82% (91) ku: 71.82% (91) lt_LT: 92.56% (24) lv_LV: 71.82% (91) mk_MK: 85.13% (48) ms_MY: 82.66% (56) nb_NO: 80.49% (63) ne_NP: 66.56% (108) nl_BE: 71.82% (91) nl_NL: 99.07% (3) nn_NO: 91.64% (27) pl_PL: 100.00% (0) pt_BR: 92.56% (24) pt_PT: 97.83% (7) ro_RO: 71.82% (91) ru_RU: 98.76% (4) si_LK: 71.82% (91) sk_SK: 97.21% (9) sl_SI: 71.82% (91) sq_AL: 71.82% (91) sr_CS: 71.82% (91) sv_SE: 71.82% (91) th_TH: 64.70% (114) tr_TR: 92.56% (24) uk_UA: 68.11% (103) vi_VN: 59.44% (131) zh_CN: 96.59% (11) zh_TW: 92.56% (24)