Mark untrusted certificates as such in Linux UI.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index bec566427cd37d82107ec6d4e254357b85e008ed..5e0be1b8557765782370c50f83ec25dd608a2b2e 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -3353,6 +3353,9 @@ are declared in build/common.gypi.
       <message name="IDS_CERT_MANAGER_WRITE_ERROR_FORMAT" desc="The text in the error dialog for PKCS #12 file write errors.">
         There was an error while trying to write the file: <ph name="ERROR_TEXT">$1<ex>Permission denied.</ex></ph>.
       </message>
+      <message name="IDS_CERT_MANAGER_UNTRUSTED" desc="This text is displayed next to untrusted certificates in a red box. Untrusted certificates are sometimes added in order to explicitly distrust them. Thus, they will be listed but it's important that the user note that they serve a different purpose from the rest.">
+        Untrusted
+      </message>
       <message name="IDS_CERT_MANAGER_PKCS12_IMPORT_ERROR_TITLE" desc="The title in the error dialog for PKCS #12 file import errors.">
         PKCS #12 Import Error
       </message>