Running Software (issues missing this information will be deleted):

• Addon version: 8.3.4-8.3.0
• Server patch: 8.3.0.33369

Have you read the changelog? (please don't waste our time)
Yes

Describe the bug
When I log on with any character running PetTracker, I get an LUA error.

To Reproduce
Steps to reproduce the behaviour:

1. Log on with a character using PetTracker (German client)

Expected behaviour
There should be no error.

Screenshots
Not necessary?

Error Logs
Message: ...dOns\PetTracker\libs\AceLocale-3.0\AceLocale-3.0.lua:49: assertion failed!
Time: Fri Feb 28 17:56:26 2020
Count: 1
Stack: ...dOns\PetTracker\libs\AceLocale-3.0\AceLocale-3.0.lua:49: assertion failed!
[string "=[C]"]: ?
[string "@interface\AddOns\PetTracker\libs\AceLocale-3.0\AceLocale-3.0.lua"]:49: in function <...dOns\PetTracker\libs\AceLocale-3.0\AceLocale-3.0.lua:49>
[string "@interface\AddOns\PetTracker\addons\main\localization\de.lua"]:60: in main chunk

Locals: (*temporary) = false

Additional context
If I remove the parts like "string.format(" and ", L.ZoneTracker)" and replace the %s parts with the correct translation everything is fine.