Item in /give and block in /testforblock feedback translated in language defined by server instead of client

When using the /give command in any server, the message in chat uses the host's language.
Notes:
This only happens in the message. The items themselves got the right name
Steps to reproduce:

1. Change language to french or something
2. Open to lan
3. Enter lan from another computer
4. Use /give coal 1 0 on the other computer:
5. The item name in the message in chat will be in french

Affects the following feedback:

• Item name in /give
• Block name in failed /testforblock

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Code analysis by Marcono1234 can be found in this comment.