Add manifest file for Mozilla Thunderbird (Deutsch) v78.1.1 x64 (#2976)

manifests/Mozilla/Thunderbird/Thunderbird_v78.1.1/78.1.1 (DE).yaml

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+Id: Mozilla.Thunderbird.Thunderbird_v78.1.1
+Version: 78.1.1 (DE)
+Name: Thunderbird (German)
+Publisher: Mozilla
+License: Mozilla Public License Version 2.0
+LicenseUrl: https://www.mozilla.org/en-US/MPL/2.0/
+AppMoniker: thunderbird, Thunderbird (German)
+Tags: thunderbird, email, E-mail, Thunderbird (German)
+Description: Thunderbird is a free email application that’s easy to set up and customize!
+Homepage: https://www.thunderbird.net
+Installers:
+  - Arch: x64
+    Url: https://download-installer.cdn.mozilla.net/pub/thunderbird/releases/78.1.1/win64/de/Thunderbird%20Setup%2078.1.1.msi
+    Sha256: 636311C16B33605C354F0F362043F978FD812C2F817BECDDCEBB5ED86278B7EB
+    InstallerType: msi
+    Switches:
+      Custom: /norestart
+      Silent: /qn
+      SilentWithProgress: /qb