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Adding Bengali translation support
[squirrelmail.git] / doc / i18n.txt
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1SquirrelMail internationalization
2
3This document should explain how SquirrelMail internationalization works and
4provide information about some aspects of implementation.
5
61. Supported languages
72. $languages array
83. XTRA_CODE functions
94. Display of different charsets
105. IMAP folder names
11
12-------------------------------
131. Supported languages
14-------------------------------
15Valid language codes are:
16* ar - Arabic, windows-1256 charset
17* bg_BG - Bulgarian, windows-1251 charset
18* ca_ES - Catalan, iso-8859-1 charset
19* cs_CZ - Czech, iso-8859-2 charset
20* cy_GB - Welsh, iso-8859-1 charset
21* da_DK - Danish, iso-8859-1 charset
22* de_DE - German, iso-8859-1 charset
23* el_GR - Greek, iso-8859-7 charset
24* en_GB - British, iso-8859-15 charset
25* en_US - English, charset depends on $default_charset
26* es_ES - Spanish, iso-8859-1 charset
27* et_EE - Estonian, iso-8859-15 charset
28* eu_ES - Basque, iso-8859-1 charset
29* fa_IR - Farsi, utf-8 charset
30* fi_FI - Finnish, iso-8859-1 charset
31* fo_FO - Faroese, iso-8859-1 charset
32* fr_FR - French, iso-8859-1 charset
33* he_IL - Hebrew, windows-1255 charset
34* hr_HR - Croatian, iso-8859-2 charset
35* hu_HU - Hungarian, iso-8859-2 charset
36* id_ID - Indonesian, iso-8859-1 charset
37* is_IS - Icelandic, iso-8859-1 charset
38* it_IT - Italian, iso-8859-1 charset
39* ja_JP - Japanese, euc-jp charset (emails are created in iso-2022-jp)
40* ko_KR - Korean, euc-kr charset
41* lt_LT - Lithuanian, utf-8 charset
42* ms_MY - Malay, iso-8859-1 charset
43* nb_NO - Norwegian (Bokmal), iso-8859-1 charset
44* nl_NL - Dutch, iso-8859-1 charset
45* nn_NO - Norwegian (Nynorsk), iso-8859-1 charset
46* pl_PL - Polish, iso-8859-2 charset
47* pt_BR - Portuguese (Brazil), iso-8859-1 charset
48* pt_PT - Portuguese (Portugal), iso-8859-1 charset
49* ro_RO - Romanian, iso-8859-2 charset
50* ru_UA - Ukrainian Russian, koi8-r charset
51* ru_RU - Russian, utf-8 charset
52* sk_SK - Slovak, iso-8859-2 charset
53* sl_SI - Slovenian, iso-8859-2 charset
54* sr_YU - Serbian, iso-8859-2 charset
55* sv_SE - Swedish, iso-8859-1 charset
56* ug - Uighur, utf-8 charset (some systems don't support Uighur system locale)
57* th_TH - Thai, tis-620 charset
58* tl_PH - Tagalog, iso-8859-1 charset (main translation is missing, only some plugins are translated)
59* tr_TR - Turkish, iso-8859-9 charset
60* uk_UA - Ukrainian, koi8-u charset
61* zh_CN - Chinese Simplified, gb2312 charset
62* zh_TW - Chinese Traditional, big5 charset
63
64Charset totals:
65* iso-8859-1 = 21
66* iso-8859-2 = 8
67* utf-8 = 4
68* iso-8859-15 = 2
69* iso-8859-7 = 1
70* iso-8859-9 = 1
71* koi8-r = 1
72* koi8-u = 1
73* windows-1251 = 1
74* windows-1255 = 1
75* windows-1256 = 1
76* tis-620 = 1
77* gb2312 = 1
78* big5 = 1
79* euc-jp = 1
80* euc-kr = 1
81
82-------------------
832. $languages array
84-------------------
85$languages array is stored in functions/i18n.php and defines translations
86that are enabled in SquirrelMail.
87
88Format of array:
89 $languages['language_code']['key'] = 'value'
90
91Possible array key names:
92* NAME - Translation name in English. Any 8bit symbols must be html encoded.
93* CHARSET - Charset used by translation
94* ALIAS - 'language_code' should contain short language name
95 (iso-639). 'value' should contain name of other 'language_code'
96 that defines translation with NAME and CHARSET keys.
97 Entry links short language form with long form (language+country).
98 See: http://www.loc.gov/standards/iso639-2/langhome.html and
99 http://www.iso.org/iso/en/prods-services/iso3166ma/02iso-3166-code-lists/list-en1.html
100* ALTNAME - Native translation name. Any 8bit symbols must be html encoded.
101 Name is visible when $show_alternative_names is enabled.
102* LOCALE - Full locale name (in xx_XX.charset format or other format required
103 by php gettext functions). From 1.4.4/1.5.1 'value' can contain
104 array. If php version is older than 4.3.0, system uses only first
105 locale name listed in array. First locale name must be compatible
106 with FreeBSD system locale names.
107* DIR - Text direction. Used to define Right-to-Left languages. Possible
108 values 'rtl' or 'ltr'. If undefined - defaults to 'ltr'.
109* XTRA_CODE - translation uses special functions. (see chapter 3. XTRA_CODE functions)
110
111Each 'language_code' definition requires NAME+CHARSET or ALIAS keys. Other keys are
112optional.
113
114----------------------
1153. XTRA_CODE functions
116----------------------
117XTRA_CODE functions provide way to change interface behavior, when translation
118requires special handling of some SquirrelMail functions. Functions are enabled
119by setting XTRA_CODE option in $languages array and including appropriate
120functions in functions/i18n.php. First part of function name is word listed in
121$languages['language_code']['XTRA_CODE'] value. Second part is one of special
122keywords. Possible keywords:
123* _decode
124Used in src/compose.php, src/i18n.php, src/view_text.php, functions/mime.php
125Requires mbstring support
126
127* _encode
128Used in src/compose.php, src/read_body.php
129
130* _encodeheader
131Used in functions/mime.php
132Returning function
133
134* _decodeheader
135Used in functions/mime.php
136Returning function
137
138* _downloadfilename
139Used in functions/mime.php
140
141* _utf7_imap_encode
142Used in functions/imap_utf7_local.php
143Returning function
144
145* _utf7_imap_decode
146Used in functions/imap_utf7_local.php
147Returning function
148
149* _strimwidth
150Used in functions/mailbox_display.php
151Returning function
152
153* _wordwrap
154Used in functions/strings.php (sqWordWrap)
155
156--------------------------------
1574. Display of different charsets
158--------------------------------
159When SquirrelMail generates html pages, it uses charset set by translation
160selected by end user. Interface can display emails encoded in different
161charsets. In order to display characters that might be unsupported by user's
162charset, SquirrelMail uses decoding functions that convert non us-ascii symbols
163into html entities. All decoding functions are stored in functions/decode/
164directory.
165
166By default SquirrelMail includes decoding functions that support iso-8859-x,
167windows-125x, utf-8, us-ascii, koi8-r, koi8-u, tis-620, ns-4551_1, iso-ir-111,
168cp855 and cp866 charsets. Other decoding functions are distributed in separate
169packages. Separate packaging of decoding functions is supported from
170SquirrelMail 1.4.4 and 1.5.0.
171
172Some decoding functions might require php recode support. If your php
173installation does not support recode, you might be using slower and cpu/memory
174intensive functions.
175
176--------------------
1775. IMAP folder names
178--------------------
179IMAP folder names use UTF7-IMAP charset. Folder names that are stored in
180conf.pl must be encoded in UTF7-IMAP charset. SquirrelMail uses internal
181functions that convert folder names from/to utf7-imap charset. By default those
182functions work with iso-8859-1 charset. Other iso-8859-x and utf-8 charsets are
183supported only when php installation contains mbstring support.
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