diff --git a/src/applications/settings/panel/PhabricatorAccountSettingsPanel.php b/src/applications/settings/panel/PhabricatorAccountSettingsPanel.php
--- a/src/applications/settings/panel/PhabricatorAccountSettingsPanel.php
+++ b/src/applications/settings/panel/PhabricatorAccountSettingsPanel.php
@@ -53,29 +53,7 @@
       PhutilPerson::SEX_FEMALE => $label_her,
     );
 
-    $locales = PhutilLocale::loadAllLocales();
-    $is_serious = PhabricatorEnv::getEnvConfig('phabricator.serious-business');
-    $is_dev = PhabricatorEnv::getEnvConfig('phabricator.developer-mode');
-
-    $translations = array();
-    foreach ($locales as $locale) {
-      if ($is_serious && $locale->isSillyLocale()) {
-        // Omit silly locales on serious business installs.
-        continue;
-      }
-      if (!$is_dev && $locale->isTestLocale()) {
-        // Omit test locales on installs which aren't in development mode.
-        continue;
-      }
-      $translations[$locale->getLocaleCode()] = $locale->getLocaleName();
-    }
-
-    asort($translations);
-    // TODO: Implement "locale.default" and use it here.
-    $default = 'en_US';
-    $translations = array(
-      '' => pht('Server Default: %s', $locales[$default]->getLocaleName()),
-    ) + $translations;
+    $translations = $this->getTranslationOptions();
 
     $form = new AphrontFormView();
     $form
@@ -107,4 +85,81 @@
       $form_box,
     );
   }
+
+  private function getTranslationOptions() {
+    $is_serious = PhabricatorEnv::getEnvConfig('phabricator.serious-business');
+    $locales = PhutilLocale::loadAllLocales();
+
+    $group_labels = array(
+      'normal' => pht('Translations'),
+      'limited' => pht('Limited Translations'),
+      'silly' => pht('Silly Translations'),
+      'test' => pht('Developer/Test Translations'),
+    );
+
+    $groups = array_fill_keys(array_keys($group_labels), array());
+
+    $translations = array();
+    foreach ($locales as $locale) {
+      $code = $locale->getLocaleCode();
+      $name = $locale->getLocaleName();
+
+      if ($locale->isSillyLocale()) {
+        if ($is_serious) {
+          // Omit silly locales on serious business installs.
+          continue;
+        }
+        $groups['silly'][$code] = $name;
+        continue;
+      }
+
+      if ($locale->isTestLocale()) {
+        $groups['test'][$code] = $name;
+        continue;
+      }
+
+      $strings = PhutilTranslation::getTranslationMapForLocale($code);
+      $size = count($strings);
+
+      // If a translation is English, assume it can fall back to the default
+      // strings and don't caveat its completeness.
+      $is_english = (substr($code, 0, 3) == 'en_');
+
+      // Arbitrarily pick some number of available strings to promote a
+      // translation out of the "limited" group. The major goal is just to
+      // keep locales with very few strings out of the main group, so users
+      // aren't surprised if a locale has no upstream translations available.
+      if ($size > 512 || $is_english) {
+        $type = 'normal';
+      } else {
+        $type = 'limited';
+      }
+
+      $groups[$type][$code] = $name;
+    }
+
+    // TODO: Select a default properly.
+    $default = 'en_US';
+
+    $results = array();
+    foreach ($groups as $key => $group) {
+      $label = $group_labels[$key];
+      if (!$group) {
+        continue;
+      }
+
+      asort($group);
+
+      if ($key == 'normal') {
+        $group = array(
+          '' => pht('Server Default: %s', $locales[$default]->getLocaleName()),
+        ) + $group;
+      }
+
+      $results[$label] = $group;
+    }
+
+    return $results;
+  }
+
 }