The "infrastructure" to support single-byte as well as multi-byte character sets was implemented (based on the FOSS4G efforts). A multilingual terminal emulator with multi-byte support is mlterm.
Using this terminal, GRASS 6 is already able to display e.g. Japanese fonts in SQL queries (here DBF file):

Tcl/TK TTF Support

Also the TclTK based graphical user interface renders TTF characters. Here an example for simple Chinese (the underlaying .po file is coded in UTF-8):

Here an example for Hindi (the underlaying .po file is coded in UTF-8):

Major parts of GRASS 6.2+ were translated to Vietnamese:

XDRIVER TTF Support

The XDRIVER in GRASS supports True/Free Type Fonts.

Statistics of current GRASS 6 internationalization (i18N) status

The table is ordered by number of translated messages per language. The two character codes indicate the language, based on the Alpha-2 code of ISO 639-1. For download of a currently sleeping translation, please either get the file directly from the GRASS-SVN or see above.

GRASSLIBS

PO-Files Translated
messages Fuzzy
translations Untranslated
messages

Japanese grasslibs_ja.po 945

Czech grasslibs_cs.po 945

Spanish grasslibs_es.po 940 1 4

Vietnamese grasslibs_vi.po 926 10 9

Russian grasslibs_ru.po 919 19 7

Greek, Modern (1453-) grasslibs_el.po 768 40 137

German grasslibs_de.po 625 232 88

Thai grasslibs_th.po 591 257 97

French grasslibs_fr.po 584 259 102

Polish grasslibs_pl.po 514 68 363

Turkish grasslibs_tr.po 464 65 416

Portuguese grasslibs_pt.po 456 304 185

Chinese grasslibs_zh.po 433 346 166

Portuguese grasslibs_pt_br.po 333 317 295

Italian grasslibs_it.po 296 345 304

Latvian grasslibs_lv.po 229 337 379

Slovenian grasslibs_sl.po 212 372 361

Arabic grasslibs_ar.po 144 331 470

Korean grasslibs_ko.po 42 197 706

Marathi grasslibs_mr.po 20 206 719

Hindi grasslibs_hi.po 0 533 412

This table is generated weekly.

GRASSMODS

PO-Files Translated
messages Fuzzy
translations Untranslated
messages

Japanese grassmods_ja.po 5949 87

German grassmods_de.po 5918 86 31

Russian grassmods_ru.po 5808 166 61

Vietnamese grassmods_vi.po 5639 325 71

Thai grassmods_th.po 4658 1102 275

Czech grassmods_cs.po 4597

Spanish grassmods_es.po 4506 1154 375

Turkish grassmods_tr.po 2833 658 2544

Polish grassmods_pl.po 2235 1760 2040

French grassmods_fr.po 2047 2856 1132

Portuguese grassmods_pt.po 1367 3465 1203

Portuguese grassmods_pt_br.po 1335 3497 1203

Italian grassmods_it.po 950 2397 2688

Chinese grassmods_zh.po 917 2665 2453

Arabic grassmods_ar.po 502 2777 2756

Slovenian grassmods_sl.po 411 2906 2718

Latvian grassmods_lv.po 317 2421 3297

Greek, Modern (1453-) grassmods_el.po 266 334 5435

Marathi grassmods_mr.po 2 1504 4529

Korean grassmods_ko.po 1 1143 4891

Hindi grassmods_hi.po 0 3851 2184

This table is generated weekly.

GRASSTCL

PO-Files Translated
messages Fuzzy
translations Untranslated
messages

Japanese grasstcl_ja.po 1463

Czech grasstcl_cs.po 1462

Russian grasstcl_ru.po 1438 14 11

Vietnamese grasstcl_vi.po 1435 15 13

French grasstcl_fr.po 1410 38 15

Thai grasstcl_th.po 1406 41 16

Indonesian grasstcl_id.po 1404 43 16

Portuguese grasstcl_pt_br.po 1343 74 46

Portuguese grasstcl_pt.po 1177 194 92

Italian grasstcl_it.po 1138 182 143

Polish grasstcl_pl.po 1127 101 235

Turkish grasstcl_tr.po 1112 35 316

Spanish grasstcl_es.po 1058 270 135

German grasstcl_de.po 1016 214 233

Chinese grasstcl_zh.po 219 29 1215

Amharic grasstcl_am.po 174 90 1199

Slovenian grasstcl_sl.po 0 1463

Korean grasstcl_ko.po 0 1463

Arabic grasstcl_ar.po 0 1463

Greek, Modern (1453-) grasstcl_el.po 0 1463

Hindi grasstcl_hi.po 0 1463

Latvian grasstcl_lv.po 0 133 1330

Marathi grasstcl_mr.po 0 1463

This table is generated weekly.

GRASSWXPY

PO-Files Translated
messages Fuzzy
translations Untranslated
messages

Czech grasswxpy_cs.po 1713

Japanese grasswxpy_ja.po 1712

German grasswxpy_de.po 1685 2 25

Spanish grasswxpy_es.po 1672 30 10

Vietnamese grasswxpy_vi.po 1516 154 48

Russian grasswxpy_ru.po 1453 185 74

Polish grasswxpy_pl.po 1312 194 206

Italian grasswxpy_it.po 1262 104 346

Indonesian grasswxpy_id.po 1254 312 146

Turkish grasswxpy_tr.po 1132 167 413

Portuguese grasswxpy_pt.po 1002 620 90

French grasswxpy_fr.po 776 203 733

Chinese grasswxpy_zh.po 109 153 1450

Greek, Modern (1453-) grasswxpy_el.po 0 1712

This table is generated weekly.
The relevant column is 'Translated messages' as the message files do not necessarily contain all available messages of GRASS 6.

Last change: $Date: 2008-11-27 07:55:48 -0800 (Thu, 27 Nov 2008) $
$Author: neteler $