SoapboxConfig: make displayFqn configurable

app/soapbox/actions/soapbox.js

@@ -42,7 +42,7 @@ export const defaultConfig = ImmutableMap({
   }),
   allowedEmoji: allowedEmoji,
   verifiedCanEditName: false,
-  displayFqn: false,
+  displayFqn: true,
 });
 
 export function getSoapboxConfig(state) {

app/soapbox/features/soapbox_config/index.js

@@ -41,6 +41,7 @@ const messages = defineMessages({
   rawJSONLabel: { id: 'soapbox_config.raw_json_label', defaultMessage: 'Advanced: Edit raw JSON data' },
   rawJSONHint: { id: 'soapbox_config.raw_json_hint', defaultMessage: 'Edit the settings data directly. Changes made directly to the JSON file will override the form fields above. Click "Save" to apply your changes.' },
   verifiedCanEditNameLabel: { id: 'soapbox_config.verified_can_edit_name_label', defaultMessage: 'Allow verified users to edit their own display name.' },
+  displayFqnLabel: { id: 'soapbox_config.display_fqn_label', defaultMessage: 'Display domain even for local accounts.' },
 });
 
 const listenerOptions = supportsPassiveEvents ? { passive: true } : false;
@@ -241,6 +242,12 @@ class SoapboxConfig extends ImmutablePureComponent {
                 checked={soapbox.get('verifiedCanEditName') === true}
                 onChange={this.handleChange(['verifiedCanEditName'], (e) => e.target.checked)}
               />
+              <Checkbox
+                name='verifiedCanEditName'
+                label={intl.formatMessage(messages.displayFqnLabel)}
+                checked={soapbox.get('displayFqn') === true}
+                onChange={this.handleChange(['displayFqn'], (e) => e.target.checked)}
+              />
             </FieldsGroup>
             <FieldsGroup>
               <div className='input with_block_label popup'>