Add locale file template
Add locale file template

- Adds a more detailed template for the en.yml file provided with the extension skeleton.
- I've left the sample keys uncommented, but added a comment advising that they be removed.

datitisev/core,Albert221/core,malayladu/core,Albert221/core,renyuneyun/core,flarum/core,flarum/core,Luceos/core,Albert221/core,Luceos/core,malayladu/core,Luceos/core,datitisev/core,malayladu/core,renyuneyun/core,Albert221/core,renyuneyun/core,renyuneyun/core,datitisev/core,datitisev/core,flarum/core,Luceos/core,malayladu/core