13. A mobile device of a mobile messaging system for authoring and using message templates on the mobile device, the mobile device maintaining a user-specified name for a category that is associated with two or more related message templates, wherein the user-specified name for the category includes a statement summarizing content of at least one message template associated with the category without including all of the content; the category being defined using the user-specified name for the category, wherein the category has a meaning and the two or more related message templates share the meaning and are in a same language, wherein a keyword is defined for each message template associated with the category, and wherein each keyword is a unique identifier for the associated message template to allow a messaging user to use the associated message template in a mobile message, and wherein one or more properties associated with the category is specified, said one or more properties including an identification property that is used for logically associating the category with a same category in a different language, the mobile device comprising: a computing device; a storage device comprising executable instructions stored therein, the instructions, when executed by the computing device, cause the computing device to: receive, the messaging user via a multi-modal user interface of the mobile device, a spoken input; compose a mobile message based on the spoken input at least by selecting, based on the spoken input, a one of the message templates, at least in part by recognizing a category and/or a keyword in the spoken input; translate the mobile message if a language of an addressee is a different language; and send the mobile message over a network to a remote addressee device of the mobile messaging system.
14. The mobile device of claim 13 , wherein the one or more properties comprise a language property that specifies a language of subcategories and templates associated with the category.