Update boss_form.erl

add translation function to the form.
you can use it to translate label and place holder.

ex CB app in a controller:
login('GET', [], ReqCtx) ->
 AppName = my_awesome_app, 
 TranslatorPid = boss_web:translator_pid(AppName),
 Locale = "fr", 
 Lookup =  fun(S) -> 
                      case boss_translator:fun_for(TranslatorPid, Locale)  of
                          none -> S;
                          F -> F(S)
                      end 
              end, 
 Form = boss_form:new(login_form, [], Lookup),
 {ok, [{form, Form}]}.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>..

login_form.erl
-module(login_form, [InitialData, Errors, Lookup]).
-compile(export_all).

form_fields() ->
    [
     {email, [{type, char_field},
                 {label, Lookup("Email")},
                 {required, true},
                 {html_options, [{class, "input-large col-xs-12"},
                                {placeholder, Lookup("type email")}]}]}
     ,{password, [{type, char_field},
                 {widget, password_input},
                 {label, Lookup("Password")},
                 {required, true},
                 {html_options, [{class, "input-large col-xs-12"},
                                {placeholder, Lookup("type password")}]}]}
   ].