Since 1.17 a whole lot of extensions have sprouted *.i18n.magic.php files. Most of...

Since 1.17 a whole lot of extensions have sprouted *.i18n.magic.php files. Most of these files have entries which erroneously omit the English synonym for a magic word. This breaks the extension completely when an affected language is selected.

This patch automatically includes synonyms from the fallback localisation, and prevents the case flag from being overridden, thus making extensions resistant to translator error.