"Adding a template" usability issues

1. The text box for the template name isn't clearly labelled.

2. Attempting to save without entering a template name would close the window without any errors, so users have no idea if the template is actually created.

3. A lot of this should be auto-generated. For example, every Job (not counting TFJob or PytorchJob) contain these fields:
```
apiVersion: batch/v1
kind: Job
metadata:
name: {{.Trial}}
namespace: {{.NameSpace}}
spec:
template:
spec:
containers:
- name: {{.Trial}}
restartPolicy: Never
```

Only the image and command fields require customization. So ideally the user should not need to craft a verbose Yaml file here.

4. Would be good to have template validation (assuming that the user needs to input a raw yaml file - see the item above).