Update language error message language

This CL updates the language on two error messages in translate_prefs.cc

Bug: 1028966
Change-Id: Id15a6886e257007988763b4e557ee5da02b1db68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587608Reviewed-by: Megan Jablonski <megjablon@chromium.org>
Commit-Queue: Trevor  Perrier <perrier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836790}

components/translate/core/browser/translate_prefs.cc

@@ -529,7 +529,7 @@ void TranslatePrefs::AddLanguagePairToAlwaysTranslateList(
   DictionaryPrefUpdate update(prefs_, kPrefAlwaysTranslateLists);
   base::DictionaryValue* dict = update.Get();
   if (!dict) {
-    NOTREACHED() << "Unregistered translate whitelist pref";
+    NOTREACHED() << "Always translate pref is unregistered";
     return;
   }
   dict->SetStringKey(original_language, target_language);
@@ -541,7 +541,7 @@ void TranslatePrefs::RemoveLanguagePairFromAlwaysTranslateList(
   DictionaryPrefUpdate update(prefs_, kPrefAlwaysTranslateLists);
   base::DictionaryValue* dict = update.Get();
   if (!dict) {
-    NOTREACHED() << "Unregistered translate whitelist pref";
+    NOTREACHED() << "Always translate pref is unregistered";
     return;
   }
   dict->RemoveKey(original_language);