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Joomla 1.5 -> Joomla 2.5

backup files and database
download, install and run jupgrade
http://docs.joomla.org/J2.5:Migrating_from_Joomla_1.5_to_Joomla_2.5
install updates
install system language packs
configure content language: extensions → language → content
IDs of tables jos_languages.id and j25_languages.lang_id must correspond

copy joomfish language tables:

CREATE TABLE j25_falang_content( PRIMARY KEY (id)) ENGINE = MYISAM CHARACTER SET utf8 COLLATE utf8_general_ci SELECT * FROM jos_jf_content;
CREATE TABLE j25_falang_tableinfo( PRIMARY KEY (id)) ENGINE = MYISAM CHARACTER SET utf8 COLLATE utf8_general_ci SELECT * FROM jos_jf_tableinfo;
ALTER TABLE j25_falang_content CHANGE COLUMN id id INT UNSIGNED NOT NULL AUTO_INCREMENT;
ALTER TABLE j25_falang_tableinfo CHANGE COLUMN id id INT UNSIGNED NOT NULL AUTO_INCREMENT;