Select 'Once' option by default

Also fixes a small typo in an unrelated part of the code.

GH-514

src/browser/components/SettingsPage.jsx

@@ -458,7 +458,10 @@ const SettingsPage = createReactClass({
             name='bounceIconType'
             value='informational'
             disabled={!this.state.notifications.bounceIcon}
-            defaultChecked={this.state.notifications.bounceIconType === 'informational'}
+            defaultChecked={
+              !this.state.notifications.bounceIconType ||
+              this.state.notifications.bounceIconType === 'informational'
+            }
             onChange={this.handleBounceIconType}
           >{'once'}</Radio>
           {' '}

src/common/settings.js

@@ -14,7 +14,7 @@ const upgradePreferences = require('./config/upgradePreferences');
 function loadDefault(spellCheckerLocale) {
   const config = JSON.parse(JSON.stringify(defaultPreferences));
   return Object.assign({}, config, {
-    spellCheckerLocale: spellCheckerLocale || defaultPreferences.pellCheckerLocale || 'en-US'
+    spellCheckerLocale: spellCheckerLocale || defaultPreferences.spellCheckerLocale || 'en-US'
   });
 }