Issue title: Appium Locator displayed unknown symbols
 Issue body: ## Appium Desktop

## The problem
Appium Locator displayed unknown symbols in the `Selected Element` window


## Environment

- I am running Appium Desktop version _Version 1.15.1 (116.69.203.11591013.2)_.
- I am on (pick one):
    - [x] Mac
    - [ ] Windows
    - [ ] Linux
<img width="1007" alt="Screen Shot 2020-03-06 at 16 32 17" src="https://user-images.githubusercontent.com/44227371/76092764-a2581180-5fc8-11ea-935d-436e568eb9a1.png">
 Comments: 
 Comment 0: What about them in the result of `source` command?
 Comment 1: Perhaps https://github.com/appium/appium-desktop/pull/1348 fixed this, too
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