David Taylor 03363d03e8 FEATURE: Load theme setting descriptions from theme locale files
Previously theme setting descriptions were defined in the `settings.yml` file like this:
```
setting_name:
  default: "My Default Value"
  description:
    en: "English description"
    fr: "French description"
```

This commit allows developers to store the localised descriptions in the theme locale files instead:
```
en:
  theme_metadata:
    description: Theme Description
    settings:
      setting_name: "The localised description for setting_name"
```
2019-05-31 14:49:59 +01:00
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