Finish the localization of the application

As thierryve didn't answer, I finished the localization of phpServerMon.
But you need some explanations.
1) Some date translation needs to be localized and the function date() cannot do it. So I used the function strftime. But this function needs the php locale to be set by setlocale(). The parameter is a combination of  language code and a country code. The lang file name code is not good for that, so I add this code in the lang file itself.
2) the language file name is not correct and should use the same code. "br.lang" does not make sense because Brazil is a country, not a language. for this reason, the file should name pt_BR.lang.php, 
Portuguese from Brazil. It is not really a problem yet, but it could become so if we wanted to differentiate the American English  (en_US) from the British English (en_GB).
3) It's a shame that the language name should be translate in each language file, and it's not logical. Each language names in the configuration should be written in is own language. I made the changes for this. Now each language file are totally independent. The language name is read directly from the file itself.
4) If the current language file is not found, the English language file is used.