N°4283 - Improve textarea and OQL inputs style

- All textarea app. wide avec the same padding
- OQL fields have the same padding as the other textareas
- OQL fields have the monospaced font

css/backoffice/_fallback.scss

@@ -22,4 +22,8 @@ fieldset {
 
 legend {
   @extend .ibo-fieldset-legend;
+}
+
+textarea {
+  @extend .ibo-input-text;
 }