Description:
When pruning messages the warning field is empty on all non EN localizations.
related to #12001
Steps to reproduce:
- change on profile localization from EN eg. to DE or FR, log out, log in again
- go to a channel/room and select "prune messages"
Expected behavior:
the warning field should contain the warning text.

Actual behavior:
warning field is empty:


Server Setup Information:
- Version of Rocket.Chat Server: 0.69.2
- Operating System: Ubuntu 16.04 LTS
- Deployment Method: bundle self build
- Number of Running Instances: 1
- DB Replicaset Oplog: yes
- NodeJS Version: v8.11.3
- MongoDB Version: 3.4.17