diff --git a/src/internationalization/PhutilTranslator.php b/src/internationalization/PhutilTranslator.php
--- a/src/internationalization/PhutilTranslator.php
+++ b/src/internationalization/PhutilTranslator.php
@@ -7,6 +7,7 @@
   private $locale;
   private $localeCode;
   private $shouldPostProcess;
+  private $willTranslateCallback;
   private $translations = array();
 
   public static function getInstance() {
@@ -27,10 +28,19 @@
     return $this;
   }
 
+  public function setWillTranslateCallback($callback) {
+    $this->willTranslateCallback = $callback;
+    return $this;
+  }
+
+  public function getWillTranslateCallback() {
+    return $this->willTranslateCallback;
+  }
+
   /**
    * Add translations which will be later used by @{method:translate}.
    * The parameter is an array of strings (for simple translations) or arrays
-   * (for translastions with variants). The number of items in the array is
+   * (for translations with variants). The number of items in the array is
    * language specific. It is `array($singular, $plural)` for English.
    *
    *   array(
@@ -63,14 +73,18 @@
   }
 
   public function translate($text /* , ... */) {
+    $args = func_get_args();
+
+    if ($this->willTranslateCallback) {
+      call_user_func_array($this->willTranslateCallback, $args);
+    }
+
     if (isset($this->translations[$text])) {
       $translation = $this->translations[$text];
     } else {
       $translation = $text;
     }
 
-    $args = func_get_args();
-
     while (is_array($translation)) {
       $arg = next($args);
       $translation = $this->chooseVariant($translation, $arg);