[bisq-network/bisq] [1.2.4] Warning message after changing Language is missing languages that disputes are handled in (#3740)

[Devin Bileck]

### Description

When changing the Language from the preferences view, the warning message is missing the languages that disputes are handled in.

This is only occurring on mainnet. Regtest is fine.

#### Version

release/v1.2.4 (5880ad99c12dc5b33e1de2dc41763d94d389e3d6)

### Steps to reproduce

1. Launch an instance on mainnet.
2. Go into the preferences and change the Language to anything.

### Expected behaviour

A warning message indicating that disputes are handled in English.

### Actual behaviour

The warning message is missing the part mentioning English.

### Screenshots

Mainnet:
![image](https://user-images.githubusercontent.com/603793/70091353-caeafc80-15d0-11ea-84bb-c26105f39638.png)

Regtest:
![image](https://user-images.githubusercontent.com/603793/70091771-b3604380-15d1-11ea-9bcf-959540b4f030.png)

#### Additional info

PreferencesViewModel.getArbitrationLanguages() seems to now be returning an empty set from the v1.2 changes.

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https://github.com/bisq-network/bisq/issues/3740
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