* Completely rewriting and reformatting the code of the localisation statistics utili...

* Completely rewriting and reformatting the code of the localisation statistics utility: removing several unuseful features (viewing the obsolete messages which is already exist in checkLanguage.php, and no output which is not useful without that feature), using the languages object, replacing the Untranslated column by the Possibly untranslated (duplicate) column (written by Niklas Laxström), ignoring the ignored messages, ignoring English and (temporarily) enRTL languages, echoing directly without using a buffer, merging some changes by Niklas Laxström.
* Introducing the concept of translatable messages to the languages object, and using it instead of the English messages.
* Adding ignored messages to the obsolete messages list.
* Removing the message "metadata-fields" from the ignored messages list, as it contains help in the local language.
* Fixing a whitespace in zh-yue messages file.