Rename all visible mentions of "Service" to "Applications"

No we use "Application" term in Application Catalog. Some "Service"s
in Environments panel should be rename to "Component", but in a
separate commit.

Partial-Bug: #1304901
Change-Id: Iaa69b5b05b473beb19dcf4444e606fe8335ee9f6
Merge "Rename all visible mentions of "Service" to "Applications""