fix language picker dropdown arrow

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

@@ -55,7 +55,10 @@ exports[`<RadioGroup /> renders correctly 1`] = `
 `;
 
 exports[`<SelectDropdown /> renders correctly 1`] = `
-<select>
+<div
+  class="select-wrapper"
+>
+  <select>
     <option
       value="one"
     >
@@ -71,7 +74,8 @@ exports[`<SelectDropdown /> renders correctly 1`] = `
     >
       Three
     </option>
-</select>
+  </select>
+</div>
 `;
 
 exports[`<SimpleForm /> renders correctly 1`] = `

app/soapbox/features/forms/index.js

@@ -236,7 +236,7 @@ export class SelectDropdown extends ImmutablePureComponent {
       <option key={item} value={item}>{items[item]}</option>
     ));
 
-    const selectElem = <select {...props}>{optionElems}</select>;
+    const selectElem = <div class='select-wrapper'><select {...props}>{optionElems}</select></div>;
 
     return label ? (
       <LabelInputContainer label={label} hint={hint}>{selectElem}</LabelInputContainer>

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 {