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+SquirrelMail internationalization
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+
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+This document should explain how SquirrelMail internationalization works and
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+provide information about some aspects of implementation.
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+
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+1. Supported languages
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+2. $languages array
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+3. XTRA_CODE functions
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+4. Display of different charsets
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+5. IMAP folder names
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+
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+-------------------------------
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+1. Supported languages
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+-------------------------------
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+Valid language codes are:
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+* ar - Arabic, windows-1256 charset
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+* bg_BG - Bulgarian, windows-1251 charset
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+* ca_ES - Catalan, iso-8859-1 charset
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+* cs_CZ - Czech, iso-8859-2 charset
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+* cy_GB - Welsh, iso-8859-1 charset
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+* da_DK - Danish, iso-8859-1 charset
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+* de_DE - German, iso-8859-1 charset
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+* el_GR - Greek, iso-8859-7 charset
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+* en_GB - British, iso-8859-15 charset
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+* en_US - English, charset depends on $default_charset
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+* es_ES - Spanish, iso-8859-1 charset
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+* et_EE - Estonian, iso-8859-15 charset
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+* eu_ES - Basque, iso-8859-1 charset
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+* fa_IR - Farsi, utf-8 charset
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+* fi_FI - Finnish, iso-8859-1 charset
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+* fo_FO - Faroese, iso-8859-1 charset
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+* fr_FR - French, iso-8859-1 charset
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+* he_IL - Hebrew, windows-1255 charset
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+* hr_HR - Croatian, iso-8859-2 charset
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+* hu_HU - Hungarian, iso-8859-2 charset
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+* id_ID - Indonesian, iso-8859-1 charset
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+* is_IS - Icelandic, iso-8859-1 charset
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+* it_IT - Italian, iso-8859-1 charset
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+* ja_JP - Japanese, euc-jp charset (emails are created in iso-2022-jp)
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+* ko_KR - Korean, euc-kr charset
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+* lt_LT - Lithuanian, utf-8 charset
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+* ms_MY - Malay, iso-8859-1 charset
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+* nb_NO - Norwegian (Bokmal), iso-8859-1 charset
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+* nl_NL - Dutch, iso-8859-1 charset
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+* nn_NO - Norwegian (Nynorsk), iso-8859-1 charset
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+* pl_PL - Polish, iso-8859-2 charset
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+* pt_BR - Portuguese (Brazil), iso-8859-1 charset
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+* pt_PT - Portuguese (Portugal), iso-8859-1 charset
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+* ro_RO - Romanian, iso-8859-2 charset
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+* ru_UA - Ukrainian Russian, koi8-r charset
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+* ru_RU - Russian, utf-8 charset
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+* sk_SK - Slovak, iso-8859-2 charset
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+* sl_SI - Slovenian, iso-8859-2 charset
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+* sr_YU - Serbian, iso-8859-2 charset
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+* sv_SE - Swedish, iso-8859-1 charset
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+* ug - Uighur, utf-8 charset (some systems don't support Uighur system locale)
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+* th_TH - Thai, tis-620 charset
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+* tl_PH - Tagalog, iso-8859-1 charset (main translation is missing, only some plugins are translated)
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+* tr_TR - Turkish, iso-8859-9 charset
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+* uk_UA - Ukrainian, koi8-u charset
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+* zh_CN - Chinese Simplified, gb2312 charset
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+* zh_TW - Chinese Traditional, big5 charset
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+
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+-------------------
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+2. $languages array
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+-------------------
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+TODO: add explanation of $languages array keys
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+
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+----------------------
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+3. XTRA_CODE functions
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+----------------------
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+XTRA_CODE functions provides way to change interface behaviour, when translation
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+requires special handling of some squirrelmail functions. Functions are enabled
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+by setting XTRA_CODE option in $languages array and providing appropriate
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+functions. First part of function name is word listed in
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+$languages['language_code']['XTRA_CODE'] setting. Second part is one of special
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+keywords. Possible values:
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+* _decode
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+Used in src/compose.php, src/i18n.php, src/view_text.php, functions/mime.php
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+Requires mbstring support
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+
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+* _encode
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+Used in src/compose.php, src/read_body.php
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+
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+* _encodeheader
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+Used in functions/mime.php
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+Returning function
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+
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+* _decodeheader
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+Used in functions/mime.php
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+Returning function
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+
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+* _downloadfilename
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+Used in functions/mime.php
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+
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+* _utf7_imap_encode
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+Used in functions/imap_utf7_local.php
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+Returning function
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+
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+* _utf7_imap_decode
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+Used in functions/imap_utf7_local.php
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+Returning function
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+
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+* _strimwidth
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+Used in functions/mailbox_display.php
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+Returning function
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+
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+* _wordwrap
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+Used in functions/strings.php (sqWordWrap)
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+
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+--------------------------------
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+4. Display of different charsets
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+--------------------------------
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+TODO: add explanation of decoding functions
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+
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+--------------------
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+5. IMAP folder names
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+--------------------
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+TODO: add explanation about UTF7-IMAP and mbstring
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tokul