Fixed: Replacing 'appName' translation token

(cherry picked from commit 2e51b8792db0d3ec402672dc92c95f3cb886ef44)

Closes #3058
Fixes #3221
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f