7.0.X, 7.1.X, Master
The customer wants to overwrite the following words: From Address (key from-address) and Subject (key subject).
They are following the steps here:
0) Deploy testLanguage-1.0.0.jar
1) Go to Content and select Forms
2) Click on add new form, don't save
3) At the right top corner click on the three dots -> Settings
These words (From Address, Subject) are coming from the global language*.properties.
After following the Overriding Global Language Keys section to overwrite the From Address, the word stayed the same.