[airq] Add Radon sensor and correct spelling mistake

[Merlin10437]

This PR adds support for our radon sensor and CO was mistakenly labeled as CO2 in one place.
This improvement was not discussed on github, but our customers asked for this addition.

[lsiepel]

Thanks, i left some comments to look at. I guess this needs testing due to UoM change.

And besides these suggestions, it might happen that the readme table alignment is off. Please adapt that with your favorite markdown tool.

Edit: You also might want to look into the DCO check that is failing: https://github.com/openhab/openhab-addons/pull/20146/checks?check_run_id=61491950937

[lsiepel]

Please remove changes to this file. Translations are maintained by crowdin.

[Merlin10437]

Unfortunately there seems to have been an error in the translation then, as the CO channel was labeled as CO2. That is what I intended to fix, but I can take out the change for the CO2 channel?

[lsiepel]

that should be fixed in crowdin, not here on GitHub

[lsiepel]

Please remove changes to this file. Translations are maintained by crowdin.

[Merlin10437]

Just to clarify, I should remove the radon addition?

[lsiepel]

This file should not be changed on GitHub, it is managed by crowdin

[Copilot]

Pull request overview

This PR adds support for a new radon sensor channel to the air-Q binding and corrects a mislabeled CO vs CO₂ text in the German localization.

Changes:

• Defines a new radon channel and channel-type in thing-types.xml, wires it into AirqHandler.pollData(), and documents it in the README and example items.
• Adds i18n entries for the radon channel in English, German, and Italian property bundles.
• Fixes the German CO/CO₂ label mix-up so that co is described as CO concentration and co2 as CO₂ concentration.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
bundles/org.openhab.binding.airq/src/main/resources/OH-INF/thing/thing-types.xml	Adds a radon channel and corresponding channel-type so the binding can expose radon measurements.
bundles/org.openhab.binding.airq/src/main/resources/OH-INF/i18n/airq_it.properties	Introduces an Italian label entry for the new radon channel.
bundles/org.openhab.binding.airq/src/main/resources/OH-INF/i18n/airq_de.properties	Corrects CO/CO₂ labels and adds a German entry for the radon channel.
bundles/org.openhab.binding.airq/src/main/resources/OH-INF/i18n/airq.properties	Adds the English label for the radon channel.
bundles/org.openhab.binding.airq/src/main/java/org/openhab/binding/airq/internal/AirqHandler.java	Extends pollData() to read the radon value from the device JSON and update the new radon channel.
bundles/org.openhab.binding.airq/README.md	Documents the new radon channel in the channels table and example items so users can configure it.

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[Copilot]

In the channels table, the channel name for radon is Radon with an initial capital, whereas all other entries are lowercase and the actual channel id defined in thing-types.xml is radon. This inconsistency can mislead users copying from the README; please change the channel column entry to radon to match the defined id and surrounding entries.

Suggested change

	| Radon | Number:Dimensionless | | Radon concentration |
	| radon | Number:Dimensionless | | Radon concentration |

[jlaur]

Please also add update instructions so that the new channels will be added to existing Things.