Add char limit for localization.

issue: 2912382
Change-Id: I39fe19f22fa998953458c62f1d5aa9eecfb84dca
diff --git a/res/values/strings.xml b/res/values/strings.xml
index e9c5bec..fadb16e 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -20,7 +20,8 @@
     <string name="choose_upload">Choose file for upload</string>
     <!-- Name of menu item of a new tab.  Also used in the title bar when displaying a new tab -->
     <string name="new_tab">New window</string>
-    <!-- Name of menu item of a new incognito tab.  Also used in the title bar when displaying a new tab -->
+    <!-- Name of menu item of a new incognito tab.  Also used in the
+         title bar when displaying a new tab [CHAR LIMIT=30] -->
     <string name="new_incognito_tab">New incognito window</string>
     <!-- Name of menu item which brings up a list of the currently active tabs -->
     <string name="active_tabs">Windows</string>