UX: Allow site settings to display as textareas if they like

app/assets/javascripts/admin/templates/components/site-settings/string.hbs

@@ -1,3 +1,8 @@
-{{text-field value=value classNames="input-setting-string"}}
+{{#if setting.textarea}}
+  {{textarea value=value classNames="input-setting-textarea"}}
+{{else}}
+  {{text-field value=value classNames="input-setting-string"}}
+{{/if}}
+
 {{setting-validation-message message=validationMessage}}
 <div class='desc'>{{{unbound setting.description}}}</div>

app/assets/stylesheets/common/admin/admin_base.scss

@@ -461,7 +461,7 @@ td.flaggers td {
     .setting-controls {
       float: left;
     }
-    .input-setting-string {
+    .input-setting-string, .input-setting-textarea {
       box-sizing: border-box;
       height: 30px;
       width: 100%;
@@ -469,6 +469,9 @@ td.flaggers td {
         width: 100%;
       }
     }
+    .input-setting-textarea {
+      height: 150px;
+    }
     .input-setting-list {
       @media (max-width: $mobile-breakpoint) {
         width: 100%;
@@ -531,7 +534,7 @@ td.flaggers td {
   }
 
   .setting.overridden.string {
-    input[type=text] {
+    input[type=text], textarea {
       background-color: dark-light-diff($highlight, $secondary, 50%, -60%);
     }
   }

lib/site_setting_extension.rb

@@ -195,6 +195,8 @@ module SiteSettingExtension
           opts.merge!({valid_values: choices[s].map{|c| {name: c, value: c}}, translate_names: false})
         end
 
+        opts[:textarea] = true if static_types[s] == :textarea
+
         opts[:choices] = choices[s] if choices.has_key? s
         opts
       end