[iOS][MF] Updates translation length and meaning

Bug: 878388
Change-Id: I862518efd3209a476f5abcebd763268bbb46cf32
Reviewed-on: https://chromium-review.googlesource.com/c/1329154
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607206}

ios/chrome/app/strings/ios_strings.grd

@@ -879,7 +879,7 @@ locale.  The strings in this file are specific to iOS.
       <message name="IDS_IOS_MANUAL_FALLBACK_NO_USERNAME" desc="The title for disabled buttons on the manual fallback passwords UI when a credential doesn't contains a username. [30em]">
         No Username
       </message>
-      <message name="IDS_IOS_MANUAL_FALLBACK_USE_OTHER_PASSWORD" desc="The title for the manual fallback UI with all passwords without filter. [30em]">
+      <message name="IDS_IOS_MANUAL_FALLBACK_USE_OTHER_PASSWORD" desc="The title for the manual fallback UI with all passwords without filter." meaning="The title for a list where the user is about to select a password or username to be filled in a form [Length: 10em]">
         Use Other Password
       </message>
       <message name="IDS_IOS_MANUAL_FALLBACK_USE_OTHER_PASSWORD_WITH_DOTS" desc="The title for the button in the manual fallback passwords UI that is used to open a list of all the user credentials where they can select one to fill a form. This button is showed at the same time as a different button with  IDS_IOS_MANUAL_FALLBACK_MANAGE_PASSWORDS as title. [30em]">