From 
https://blog.mozilla.org/l10n/2019/04/02/changing-the-language-of-firefox-directly-from-the-browser/



*Language SettingsIn Firefox there are two main user facing settings 
related to languages:*
   
   - *Web content: when you visit a web page, the browser will communicate 
   to the server which languages you’d like to see content in. Technically, 
   this is done by sending an Accept-Language HTTP header, which contains a 
   list of locale codes in the user’s preferred order.*
   - *User interface: the language in which you want to see the browser 
   (menus, preferences, etc.).*
   
*The difference between the two is not as intuitive as it might seem. A lot 
of users change the web content settings, and expect the user interface to 
change.*

There you can see how to handle this. Hope, it helps!


On Thursday, September 10, 2020 at 10:37:40 AM UTC+2 [email protected] 
wrote:

> Hello All, 
>
> I will try  to present my problem simply :
> I have a web2py application with a very simply homepage user.html 
>
> User and Password labels &  Login Button are automatically translatedby 
> Firefox 
> in Firefox the detected langage 
>
> If a user enter login / password 
> I check user permissions and I show HTML page according to its permissions 
> by using some code already test as : 
>
> lastUserLogged = db(db.auth_event.description.contains('connect'
> )).select(orderby=~db.auth_event.time_stamp,limitby=(0, 1
> )).first().user_id
>
> and 
>
> lastUserName = db(db.auth_user.id == 
> lastUserLogged).select(db.auth_user.username).first().username
>
>
> In a native Firefox langage it's OK 
> But if I download new langage for Firefox restarts firefox and retry 
> all the permissions are allowed even if the user is not allowed to see 
> HTML pages
>
> Why ?? 
> I don't know but if you can help me I appreciate ... sincerly 
>
>
> The HTML Page for the user.html 
>
>
> <body>
> <style type="text/css">
> body {
> overflow:hidden;
> }
> #fond {
> position:absolute;
> top:0;
> left:0;
> }
> #web2py_user_form {
> position:absolute;
> top:50px;
> left:50px;
> }
> #auth_user_username__label{color:white;}
> #auth_user_password__label{color:white;}
> #auth_user_first_name__label{color:white;}
> #auth_user_last_name__label{color:white;}
> #auth_user_email__label{color:white;}
> #auth_user_password_two__row{color:white;}
>
> #fond,#fond img {
> width:100%;
> height:100%;
> }
> </style> 
> <div id="fond">
> <img src='/me/static/theme/images/WALLPAPERS/wallpaper.jpg' alt="fond" />
> </div>
> <div id="web2py_user_form">
> {{
> =form
> }}
> </div>
>
> <script language="javascript"><!--
> jQuery("#web2py_user_form input:visible:enabled:first").focus();
> {{if request.args(0)=='register':}}
> web2py_validate_entropy(jQuery('#auth_user_password'),100);
> {{elif request.args(0) in ('change_password','reset_password'):}}
> web2py_validate_entropy(jQuery('#no_table_new_password'),100);
> {{pass}}
> //--></script>
>
> </body>
>
>
>
>
>

-- 
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