V3: Globalization

[Frederico Caldeira Knabben]

The Globalization support has been introduced into the CKEditor prototype with [2365].

Just like FCKeditor, we try to guess the user language here, with a much simpler code though. The language file will be then loaded just one for all editor instances that share that same language.

For RTL languages, the theme sets the "dir" attribute of the outer element that holds the editor to "rtl", and adds a class named "cke_rtl" to it. In this way, it is possible to properly skin the editor for RTL.

Full language support has been added for plugins also. The "sourcearea" plugin contains an example of it. Just for this review, I've not added "en" support on the plugin, so you will note that the "Source" button will be localized to "Codice Sorgente", its Italian version for it (which is the default language of the plugin). Core plugins will have the language entries into the core language file, so the sourcearea language entries will be moved to the right place after this ticket review.

The list of languages supported by the plugin is available in the plugin definition, so the end user is not required anymore to provide it. For the plugins, the language file is also cached and reused by other editor instances.

It is possible to pack the core and the plugins language files with the packager, avoiding them to be downloaded from a different file. If the user language is not present in the packaged version, it will be downloaded from the lang folder, as usual.