Change "System Update Available" to "System Update Available. Preparing for download" while ChromeOS prepares the filesystem for the download. BUG=chromium-os:9908, chromium-os:8190 TEST=Install an update to see the change in language.
Change "System Update Available" to "System Update Available. Preparing for download" while ChromeOS prepares the filesystem for the download.
BUG=chromium-os:9908, chromium-os:8190
TEST=Install an update to see the change in language.

Review URL: http://codereview.chromium.org/5912002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@69895 0039d316-1c4b-4281-b951-d872f2087c98

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