No translation of the temperature scales

[putnik]

Describe the bug In weather messages, the temperature scale is not translated into the selected language.

To Reproduce Steps to reproduce the behavior:

1. Change language to Russian
2. Ask for current weather few times
3. Wait for message with scale
4. See untraslated scale (celsius/fahrenheit):

>> Сейчас небольшой дождь и 11 градусов celsius.
>> Сейчас дождь и 51 градусов fahrenheit.

Expected behavior Scales should be translated.

Environment:

• Device type: Raspberry Pi
• OS: Picroft
• Mycroft-core version: dev