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

[krisgesling]

Hey, thanks for flagging this. It certainly isn't the intention. I'm not sure when someone from our team will get to it so I've added a help wanted flag for now.

[forslund]

This should be resolved by #197, I started out with a simple change to just translate the unit as other things are translated but in the end I ended up suggesting a slight reorganization to make the translations occur where the dialog is built to make it easier to avoid these kinds of issues in the future.

(It was tested with Swedish)