Feature/add language option to weather agent (#1544)
Feature/add language option to weather agent (#1544)

* Add language parameter to the weather agent

* Add text forecast for Wunderground data provider

Wunderground API returns forecast for the next few days. Returned JSON response has two types of data under the "forecast" key:
- "txt_forecast": pre-formatted text representation
- "simpleforecast": raw data representation

The "period" key contains which day the node belongs to.

Currently only "simpleforecast" is available to users of the Weather agent.
This commit appends the "txt_forecast" representation to the current data set.

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