-
- *************************************
- * SquirrelMail internationalization *
- *************************************
-
-$Date$
-$Revision$
-
-This document should explain how SquirrelMail internationalization works and
-provide information about some aspects of implementation.
-
-1. Supported languages
-2. $languages array
-3. XTRA_CODE functions
-4. Display of different charsets
-5. IMAP folder names
-6. Plural forms
-7. Language setup
-8. Time zones
-
--------------------------------
-1. Supported languages
--------------------------------
-Valid language codes are:
-* ar - Arabic, windows-1256 charset
-* bg_BG - Bulgarian, windows-1251 charset
-* bn_IN - Bengali, utf-8 charset
-* ca_ES - Catalan, iso-8859-1 charset
-* cs_CZ - Czech, iso-8859-2 charset
-* cy_GB - Welsh, iso-8859-1 charset
-* da_DK - Danish, iso-8859-1 charset
-* de_DE - German, iso-8859-1 charset
-* el_GR - Greek, iso-8859-7 charset
-* en_GB - British, iso-8859-15 charset
-* en_US - English, charset depends on $default_charset
-* es_ES - Spanish, iso-8859-1 charset
-* et_EE - Estonian, iso-8859-15 charset
-* eu_ES - Basque, iso-8859-1 charset
-* fa_IR - Farsi, utf-8 charset
-* fi_FI - Finnish, iso-8859-1 charset
-* fo_FO - Faroese, iso-8859-1 charset
-* fr_FR - French, iso-8859-1 charset
-* he_IL - Hebrew, windows-1255 charset
-* hr_HR - Croatian, iso-8859-2 charset
-* hu_HU - Hungarian, iso-8859-2 charset
-* id_ID - Indonesian, iso-8859-1 charset
-* is_IS - Icelandic, iso-8859-1 charset
-* it_IT - Italian, iso-8859-1 charset
-* ja_JP - Japanese, euc-jp charset (emails are created in iso-2022-jp)
-* ko_KR - Korean, euc-kr charset
-* lt_LT - Lithuanian, utf-8 charset
-* ms_MY - Malay, iso-8859-1 charset
-* nb_NO - Norwegian (Bokmal), iso-8859-1 charset
-* nl_NL - Dutch, iso-8859-1 charset
-* nn_NO - Norwegian (Nynorsk), iso-8859-1 charset
-* pl_PL - Polish, iso-8859-2 charset
-* pt_BR - Portuguese (Brazil), iso-8859-1 charset
-* pt_PT - Portuguese (Portugal), iso-8859-1 charset
-* ro_RO - Romanian, iso-8859-2 charset
-* ru_UA - Ukrainian Russian, koi8-r charset
-* ru_RU - Russian, utf-8 charset
-* sk_SK - Slovak, iso-8859-2 charset
-* sl_SI - Slovenian, iso-8859-2 charset
-* sr_YU - Serbian, iso-8859-2 charset
-* sv_SE - Swedish, iso-8859-1 charset
-* ug - Uighur, utf-8 charset (some systems don't support Uighur system locale)
-* th_TH - Thai, tis-620 charset
-* tl_PH - Tagalog, iso-8859-1 charset (main translation is missing, only some plugins are translated)
-* tr_TR - Turkish, iso-8859-9 charset
-* uk_UA - Ukrainian, koi8-u charset
-* zh_CN - Chinese Simplified, gb2312 charset
-* zh_TW - Chinese Traditional, big5 charset
-
-Charset totals:
-* iso-8859-1 = 21
-* iso-8859-2 = 8
-* utf-8 = 5
-* iso-8859-15 = 2
-* iso-8859-7 = 1
-* iso-8859-9 = 1
-* koi8-r = 1
-* koi8-u = 1
-* windows-1251 = 1
-* windows-1255 = 1
-* windows-1256 = 1
-* tis-620 = 1
-* gb2312 = 1
-* big5 = 1
-* euc-jp = 1
-* euc-kr = 1
-
--------------------
-2. $languages array
--------------------
-$languages array is stored in functions/i18n.php (v. 1.5.0 or older) or
-locale/*/setup.php files and defines enabled SquirrelMail translations.
-
-Format of array:
- $languages['language_code']['key'] = 'value'
-
-Possible array key names:
-* NAME - Translation name in English. Any 8bit symbols must be html encoded.
-* CHARSET - Charset used by translation
-* ALIAS - 'language_code' should contain short language name
- (iso-639). 'value' should contain name of other 'language_code'
- that defines translation with NAME and CHARSET keys.
- Entry links short language form with long form (language+country).
- See: http://www.loc.gov/standards/iso639-2/langhome.html and
- http://www.iso.org/iso/en/prods-services/iso3166ma/02iso-3166-code-lists/list-en1.html
-* ALTNAME - Native translation name. Any 8bit symbols must be html encoded.
- Name is visible when $show_alternative_names is enabled.
-* LOCALE - Full locale name (in xx_XX.charset format or other format required
- by php gettext functions). From 1.4.4/1.5.1 'value' can contain
- array. If php version is older than 4.3.0, system uses only first
- locale name listed in array. First locale name must be compatible
- with FreeBSD system locale names.
-* DIR - Text direction. Used to define Right-to-Left languages. Possible
- values 'rtl' or 'ltr'. If undefined - defaults to 'ltr'.
-* XTRA_CODE - translation uses special functions. (see chapter 3. XTRA_CODE functions)
-
-Each 'language_code' definition requires NAME+CHARSET or ALIAS keys. Other keys are
-optional.
-
-----------------------
-3. XTRA_CODE functions
-----------------------
-XTRA_CODE functions provide way to change interface behavior, when translation
-requires special handling of some SquirrelMail functions. Functions are enabled
-by setting XTRA_CODE option in $languages array and including appropriate
-functions in locale/language_code/setup.php. First part of function name is word
-listed in $languages['language_code']['XTRA_CODE'] value. Second part is one of special
-keywords. Possible keywords:
-* _decode
-Used in src/compose.php, src/i18n.php, src/view_text.php, functions/mime.php
-Requires mbstring support
-
-* _encode
-Used in src/compose.php, src/read_body.php
-
-* _encodeheader
-Used in functions/mime.php
-Returning function
-
-* _decodeheader
-Used in functions/mime.php
-Returning function
-
-* _downloadfilename
-Used in functions/mime.php
-
-* _utf7_imap_encode
-Used in functions/imap_utf7_local.php
-Returning function
-
-* _utf7_imap_decode
-Used in functions/imap_utf7_local.php
-Returning function
-
-* _strimwidth
-Used in functions/mailbox_display.php
-Returning function
-
-* _wordwrap
-Used in functions/strings.php (sqWordWrap)
-
---------------------------------
-4. Display of different charsets
---------------------------------
-When SquirrelMail generates html pages, it uses charset defined in translation
-selected by end user. Interface can display emails encoded in different
-charsets. In order to display characters that might be unsupported by user's
-charset, SquirrelMail uses decoding functions that convert non us-ascii symbols
-into html entities. All decoding functions are stored in functions/decode/
-directory.
-
-By default SquirrelMail includes decoding functions that support iso-8859-x,
-windows-125x, utf-8, us-ascii, koi8-r, koi8-u, tis-620, ns-4551_1, iso-ir-111,
-cp855 and cp866 charsets. Other decoding functions are distributed in separate
-packages. Separate packaging of decoding functions is supported from
-SquirrelMail 1.4.4 and 1.5.0. us-ascii decoding replaces all 8bit symbols with
-question marks. utf-8 decoding function does not enable decoding of five and six
-byte utf-8 symbols by default (code is commented) and replaces all incorrectly
-formated 8bit symbols with question marks.
-
-Some decoding functions might require php recode extension or php 4.3+ mbstring
-extension. If your php installation does not support them, you might be using
-slower and cpu/memory intensive functions.
-
---------------------
-5. IMAP folder names
---------------------
-IMAP folder names use UTF7-IMAP charset. Folder names that are stored in
-conf.pl must be encoded in UTF7-IMAP charset. SquirrelMail uses internal
-functions that convert folder names from/to utf7-imap charset. By default those
-functions work with iso-8859-1 charset. Other charsets are supported only
-when php mbstring extension supports them.
-
-TODO: write independent implementation of charset to utf7-imap conversion.
-
----------------
-6. Plural forms
----------------
-From v.1.5.1 SquirrelMail includes support for plural forms. It allows the use
-of correct translation forms with numbers. For example. "We have %s squirrel
-on the roof." and "We have %s squirrels on the roof." can be written in one
-function call without checking actual number of squirrels. The gettext
-functions also deal with non English languages that might use different word
-forms for two, five, ten or more units.
-
-Plural forms support is provided by ngettext functions that exist in the php
-gettext extension as of php 4.2.0 and by ngettext function replacements from
-the php-gettext classes (http://savannah.nongnu.org/projects/php-gettext).
-In order to provide identical functionality when the php gettext extension does
-not have ngettext support, SquirrelMail uses bindtextdomain and textdomain
-wrappers that load the missing functions.
-
-If plugin authors want to use ngettext functions without increasing php
-requirements to 4.2.0 with gettext support, they should require at least
-SquirrelMail 1.5.1, and use the sq_change_text_domain function instead of
-separate calls to bindtextdomain and textdomain. If sq_change_text_domain
-cannot be used, the sq_bindtextdomain function should be used instead of
-bindtextdomain and the sq_textdomain function should be used instead of the
-textdomain function. If these latter two SquirrelMail wrapper functions are
-used (but again, please use sq_change_text_domain), there is no need to issue
-a call to sq_bindtextdomain when a plugin reverts to the SquirrelMail domain.
-
-More information about ngettext and plural forms can be found at:
-http://www.gnu.org/software/gettext/manual/html_chapter/gettext_10.html#SEC150
-
------------------
-7. Language setup
------------------
-SquirrelMail uses set_up_language() function to setup language environment.
-Environment is setup automatically when include/validate.php is loaded.
-
-SquirrelMail gets interface language from three places:
- a) user preference. It is set in Options -> Display Preferences -> Language.
- preference uses language key. If user's preferences are not available (user
- is not logged in), system tries to extract language value from
- 'squirrelmail_language' cookie.
- b) default squirrelmail language that is set in configuration
- ($squirrelmail_default_language variable).
- c) preferred language setting provided by browser. It is used only when default
- squirrelmail language is set to empty string
-
-If language information is not available, SquirrelMail falls back to US English
-translation.
-
--------------
-8. Time zones
--------------
-If php install allows modifying environment variable TZ, SquirrelMail allows
-end users to select different time zone in their preferences. It can be set in
-Options -> Personal Information -> Your current timezone. Time zone is
-setup automatically when include/validate.php is loaded.
-
-If TZ variable can't be modified (php is running is safe mode and variable
-is not listed in php safe_mode_allowed_env_vars), user's time zone options are
-not visible and interface uses default webserver's time zone.
-
-SquirrelMail 1.5.0 and older store list of available time zones in
-locale/timezones.cfg. Since 1.5.1 standard times zones are moved to
-include/timezones/standard.php and time zone handling differs from older
-SquirrelMail versions. Time zone configuration is controlled in SquirrelMail
-configuration utility (conf.pl), 4. General Options -> 15. Time zone
-configuration menu option. Administrator can select standard, strict, custom
-and custom strict time zone handling.
-
-Standard handling does not differ from previous SquirrelMail versions and
-SquirrelMail uses GNU C geographical location based time zone names. Strict
-handling uses time zone codes with offset from GMT. Strict time zones should
-work on systems that don't support GNU C time zone naming. Custom and custom
-strict handling uses config/timezones.php file instead of
-include/timezones/standard.php.
-
-config/timezones.php file should store $aTimeZones array with different set of
-time zones. See default time zone set in include/timezones/standard.php.For
-example:
-
-<?php
-// World outside US border is a mirage
-
-$aTimeZones=array();
-$aTimeZones['America/New_York']['NAME']='US Eastern standard time';
-$aTimeZones['America/New_York']['TZ']='EST5EDT';
-
-$aTimeZones['America/Chicago']['NAME']='US Central standard time';
-$aTimeZones['America/Chicago']['TZ']='CST6CDT';
-
-// Oliver County, ND
-$aTimeZones['America/North_Dakota/Center']['NAME']='US, Oliver County [ND]';
-$aTimeZones['America/North_Dakota/Center']['TZ']='CST6CDT'; // CST since 1992
-
-$aTimeZones['America/Denver']['NAME']='US Mountain standard time';
-$aTimeZones['America/Denver']['TZ']='MST7MDT';
-
-$aTimeZones['America/Los_Angeles']['NAME']='US Pacific standard time';
-$aTimeZones['America/Los_Angeles']['TZ']='PST8PDT';
-
-// Aliaska
-$aTimeZones['America/Juneau']['NAME']='Aliaska, Juneau';
-$aTimeZones['America/Juneau']['TZ']='NAST9NADT';
-$aTimeZones['America/Yakutat']['NAME']='Aliaska, Yakutat';
-$aTimeZones['America/Yakutat']['TZ']='NAST9NADT';
-$aTimeZones['America/Anchorage']['NAME']='Aliaska, Anchorage';
-$aTimeZones['America/Anchorage']['TZ']='NAST9NADT';
-$aTimeZones['America/Nome']['NAME']='Aliaska, Nome';
-$aTimeZones['America/Nome']['TZ']='NAST9NADT';
-$aTimeZones['America/Adak']['NAME']='US, Aleutian Islands';
-$aTimeZones['America/Adak']['TZ']='AST10ADT';
-
-$aTimeZones['Pacific/Honolulu']['NAME']='US, Hawaii';
-$aTimeZones['Pacific/Honolulu']['TZ']='UCT10';
-$aTimeZones['America/Phoenix']['NAME']='US, Arizona';
-$aTimeZones['America/Phoenix']['TZ']='MST7'; // gmt-7
-$aTimeZones['America/Shiprock']['LINK']='America/Denver';
-
-$aTimeZones['America/Boise']['NAME']='US, South Idaho';
-$aTimeZones['America/Boise']['TZ']='MST7MDT';
-$aTimeZones['America/Indianapolis']['NAME']='US, Indiana';
-$aTimeZones['America/Indianapolis']['TZ']='EST5';
-$aTimeZones['America/Indiana/Indianapolis']['LINK']='America/Indianapolis';
-// Crawford County, Indiana
-$aTimeZones['America/Indiana/Marengo']['NAME']='US, Crawford County [IN]';
-$aTimeZones['America/Indiana/Marengo']['TZ']='EST5';
-// Starke County, Indiana
-$aTimeZones['America/Indiana/Knox']['NAME']='US, Starke County [IN]';
-$aTimeZones['America/Indiana/Knox']['TZ']='EST5';
-// Switzerland County, Indiana
-$aTimeZones['America/Indiana/Vevay']['NAME']='US, Switzerland County [IN]';
-$aTimeZones['America/Indiana/Vevay']['TZ']='EST5';
-$aTimeZones['America/Louisville']['NAME']='US, Louisville [KY]';
-$aTimeZones['America/Louisville']['TZ']='EST5EDT';
-$aTimeZones['America/Kentucky/Louisville']['LINK']='America/Louisville';
-// Wayne, Clinton, and Russell Counties, Kentucky
-$aTimeZones['America/Kentucky/Monticello']['NAME']='US, Wayne, Clinton, and Russell Counties [KY]';
-$aTimeZones['America/Kentucky/Monticello']['TZ']='EST5EDT';
-// Michigan
-$aTimeZones['America/Detroit']['NAME']='US, Michigan';
-$aTimeZones['America/Detroit']['TZ']='EST5EDT';
-// The Michigan border with Wisconsin switched from EST to CST/CDT in 1973.
-$aTimeZones['America/Menominee']['NAME']='US, Menominee [MI]';
-$aTimeZones['America/Menominee']['TZ']='CST6CDT';
-?>
-
-GNU C time zone naming should be supported by many Unix OSes. It is recommended
-way of setting time zone, because it handles historical changes and daylight
-savings specific to selected geographical location. Strict time zones might
-provide inaccurate or outdated time zone settings.
-
-If modifications in TZ environment are visible in your webserver's logs (time
-offset is changed), make sure that you can reproduce such behavior in latest php
-version and report bug to php developers. Issue can be fixed by blocking use of
-time zone (php safe mode and TZ is not listed in safe_mode_allowed_env_vars
-setting or forced_prefs plugin) or by attaching special php script with
-putenv('TZ=some time zone') call in php auto_append_file setting (suggestion is
-not tested and you might have to fix all SquirrelMail exit calls).
-
-Please note, that use of auto_append_file provides only temporally workaround
-and does not fix your php setup. Script that runs as unprivileged user, should
-be unable to affect webserver's logging system.
-
+See: http://example.com/sm_cvs/documentation/devel/devel-3.html
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