Add translation string for alternating color in setting & specify the font will not be bold anymore (#1490)

* Add translation string

* Add translation string & be more clear about what does it do

templates/site/user/public/settings.jet.html

@@ -31,7 +31,7 @@
     <input type="text" name="mascot_url" class="form-input" value="{{ MascotURL }}"/>
     <br/>
 
-    <h3>Alternating Colors</h3>
+    <h3>{{ T("alternating_color") }}</h3>
     <select id="altColors-selector" name="altColors" class="form-input">
       <option value="false">Disabled</option>
       <option value="true" {{if AltColors}}selected{{end}}>Enabled</option>

translations/en-us.all.json

@@ -1307,6 +1307,10 @@
     "id": "mascot_url",
     "translation": "Mascot URL"
   },
+  {
+    "id": "alternating_color",
+    "translation": "Alternating Color (and non-bold fonts)"
+  },
   {
     "id": "no_notifications",
     "translation": "No Notifications"