[BUG] Metric, US imperial, British imperial (Volume units)

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Describe the bug In "Volume", it's not clear which units refer to Metric, US imperial, or British imperial. This applies to gallons, quarts, pints, cups, tablespoons, and teaspoons. May also apply to other units.

To Reproduce Steps to reproduce the behavior:

1. Go to "Volume → Cups"
2. Click on "Cups"
3. Enter "1" Cups
4. 240ml = ???
5. 1 metric cup = 250ml, 1 US cup is 236.5882365ml, 1 British cup = 284.130625ml

Expected behavior I'd like to have clearly labelled units for US, UK, and metric, relating to gallons, quarts, pints, cups, tablespoons, and teaspoons, and similar units of volume.

Screenshots / gif N/A

Device

• Device type: Android
• OS version: Android 10
• Device type: Moto G Power

Additional context N/A