fix language picker dropdown arrow

app/soapbox/features/forms/__tests__/__snapshots__/forms-test.js.snap

@@ -55,23 +55,27 @@ exports[`<RadioGroup /> renders correctly 1`] = `
 `;
 
 exports[`<SelectDropdown /> renders correctly 1`] = `
-<select>
-  <option
-    value="one"
-  >
-    One
-  </option>
-  <option
-    value="two"
-  >
-    Two
-  </option>
-  <option
-    value="three"
-  >
-    Three
-  </option>
-</select>
+<div
+  class="select-wrapper"
+>
+  <select>
+    <option
+      value="one"
+    >
+      One
+    </option>
+    <option
+      value="two"
+    >
+      Two
+    </option>
+    <option
+      value="three"
+    >
+      Three
+    </option>
+  </select>
+</div>
 `;
 
 exports[`<SimpleForm /> renders correctly 1`] = `

app/styles/forms.scss

@@ -429,6 +429,7 @@ code {
   }
 
   select {
+    appearance: none;
     box-sizing: border-box;
     font-size: 16px;
     color: var(--primary-text-color);
@@ -444,6 +445,23 @@ code {
     padding-right: 30px;
     height: 41px;
     position: relative;
+    margin-top: 8px;
+    cursor: pointer;
+  }
+
+  .select-wrapper::after {
+    display: block;
+    font-family: 'ForkAwesome';
+    content: '';
+    width: 10px;
+    position: absolute;
+    right: 12px;
+    top: 1px;
+    border-left: 1px solid var(--highlight-text-color);
+    height: 39px;
+    padding: 12px;
+    box-sizing: border-box;
+    pointer-events: none;
   }
 
   .label_input {