MBS-11722: Don't preselect basic as language proficiency

Users are apparently often selecting "basic" when it seems incorrect,
probably because it is selected by default. "Arabic" is also selected
by default, and we seem to have 900+ users with "Arabic (basic)".
This might be true, but I find it unlikely.

lib/MusicBrainz/Server/Form/Role/UserProfile.pm

@@ -3,7 +3,7 @@ package MusicBrainz::Server::Form::Role::UserProfile;
 use HTML::FormHandler::Moose::Role;
 use List::MoreUtils qw( any all );
 use MusicBrainz::Server::Form::Utils qw( language_options select_options_tree validate_username );
-use MusicBrainz::Server::Translation qw( l ln );
+use MusicBrainz::Server::Translation qw( l ln N_l );
 use MusicBrainz::Server::Validation qw( is_valid_url );
 
 has_field 'username' => (
@@ -53,11 +53,13 @@ has_field 'languages' => (
 
 has_field 'languages.language_id' => (
     type => 'Select',
+    messages => { required => N_l('A language is required.') },
     required => 1
 );
 
 has_field 'languages.fluency' => (
     type => 'Select',
+    messages => { required => N_l('A fluency level is required.') },
     required => 1
 );
 

root/static/scripts/account/components/EditProfileForm.js

@@ -280,13 +280,13 @@ class EditProfileForm extends React.Component<Props, State> {
             {field.languages.field.map((languageField, index) => (
               <li className="language" key={index}>
                 <SelectField
-                  allowEmpty={false}
+                  allowEmpty
                   field={languageField.field.language_id}
                   onChange={(e) => this.handleLanguageChange(e, index)}
                   options={this.state.languageOptions}
                 />
                 <SelectField
-                  allowEmpty={false}
+                  allowEmpty
                   field={languageField.field.fluency}
                   onChange={(e) => this.handleFluencyChange(e, index)}
                   options={fluencyOptions}
@@ -300,6 +300,8 @@ class EditProfileForm extends React.Component<Props, State> {
                     {l('Remove')}
                   </button>
                 </span>
+                <FieldErrors field={languageField.field.language_id} />
+                <FieldErrors field={languageField.field.fluency} />
               </li>
             ))}
             <li key="add">