Here is the script to fix the identities table
ALTER TABLE `identities` MODIFY COLUMN `organization` VARCHAR(128) CHARACTER SET utf8 COLLATE utf8_general_ci,
MODIFY COLUMN `reply-to` VARCHAR(128) CHARACTER SET utf8 COLLATE utf8_general_ci,
MODIFY COLUMN `bcc` VARCHAR(128) CHARACTER SET utf8 COLLATE utf8_general_ci,
MODIFY COLUMN `signature` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci,
MODIFY COLUMN `html_signature` TINYINT(1);
And the one for the contacts table
ALTER TABLE `contacts` MODIFY COLUMN `firstname` VARCHAR(128) CHARACTER SET utf8 COLLATE utf8_general_ci,
MODIFY COLUMN `surname` VARCHAR(128) CHARACTER SET utf8 COLLATE utf8_general_ci,
MODIFY COLUMN `vcard` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci;