Add a second language with "en" by default

Nobody has claimed this yet.

With this option, you can translate phpsecinfo with a second language

Example, add "it"

If a test code was translate with a new language line, "it" , then, the new language "it" define by defaut work. If "it" is define by defaut, but, a test code not translate, then, "en" work.

PhpSecInfo can now use a lot of language :
fr / en
it / en
de / en
...

Select your language and translate all test language line ( 3 or 4 line ) with the new language code. Else, english work always.

https://github.com/ZerooCool/phpsecinfo/commit/f74e518fcf708b2f65211f6d08c400ae4f65a3c2
+ i add this variable in Test.php before the code for translation.

```
public $langue_defaut;
public $langue_definie;
```

Start with Test.php and the referenced commit to understand the existing language variables and translation lines. Add the default-language behavior so translated lines use the selected language while untranslated lines fall back to English, then verify the existing language cases including fr, it, and de.

Written by the indexing model from the issue text.