[Password Manager] Export UI string updates

TBR=jcivelli@chromium.org

Bug: 812998
Change-Id: I34b710517d8c6b066e9f66d6f98863194046ddfd
Reviewed-on: https://chromium-review.googlesource.com/923942Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Commit-Queue: Christos Froussios <cfroussios@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537279}

chrome/app/settings_strings.grdp

@@ -657,7 +657,7 @@
     Export passwords...
   </message>
   <message name="IDS_SETTINGS_PASSWORDS_EXPORT_TRY_AGAIN" desc="A button in the dialog for exporting passwords from Chrome. The action is to attempt to export the passwords again. A password list will be written to a destination, which the user will be asked to choose after initiating this action.">
-    Try again...
+    Try again
   </message>
   <message name="IDS_SETTINGS_PASSWORDS_EXPORTING_TITLE" desc="The title of a dialog for exporting passwords. This title is shown while Chrome is performing the export and the user should wait.">
     Exporting passwords...
@@ -666,7 +666,7 @@
     Can't export passwords to "<ph name="FOLDER">$1<ex>Documents</ex></ph>"
   </message>
   <message name="IDS_SETTINGS_PASSWORDS_EXPORTING_FAILURE_TIPS" desc="Message that is shown when exporting passwords has failed. Below it is a list of things the user can try to resolve the problem.">
-    Try the following tips
+    Try the following tips:
   </message>
   <message name="IDS_SETTINGS_PASSWORDS_EXPORTING_FAILURE_TIP_ENOUGH_SPACE" desc="Message that is shown when exporting passwords has failed. This is part of a list of things the user can try to resolve the problem. This advice implies that there isn't enough space on the disk for the new file to be written.">
     Make sure there is enough space on your device