There is First Emojis
before - its a keyboard extension target bundle display name and second after - its a project target bundle display name
For making change do the following steps:
- Select project -> select keyboard extension Target-> info
- Change the Bundle display name of extension target like following screenshot.

So that will be look like:

UPDATE:
For setting shorter name i did my project target .plist remove Bundle Display name and make there Bundle name as a Thumb

In my extension .plist i add Bundle Display name to Thumb

Now its look like:

