Add service widget for Technitium DNS Server

Add technitium widget documentation
Update "en" common translation file
Update home widget files to include the technitium widget
Update service-helpers to allow 'range' field for technitium widget
Lint

docs/widgets/services/index.md

@@ -113,6 +113,7 @@ You can also find a list of all available service widgets in the sidebar navigat
 - [Syncthing Relay Server](syncthing-relay-server.md)
 - [Tailscale](tailscale.md)
 - [Tandoor](tandoor.md)
+- [Technitium DNS](technitium.md)
 - [TDarr](tdarr.md)
 - [Traefik](traefik.md)
 - [Transmission](transmission.md)

docs/widgets/services/technitium.md

@@ -0,0 +1,28 @@
+---
+title: Technitium DNS Server
+description: Technitium DNS Server Widget Configuration
+---
+
+Learn more about [Technitium DNS Server](https://technitium.com/dns/).
+
+Allowed fields (up to 4): `["totalQueries","totalNoError","totalServerFailure","totalNxDomain","totalRefused","totalAuthoritative","totalRecursive","totalCached","totalBlocked","totalDropped","totalClients"]`.
+
+Defaults to: `["totalQueries", "totalAuthoritative", "totalCached", "totalServerFailure"]`
+
+```yaml
+widget:
+  type: technitium
+  url: <url to dns server>
+  key: biglongapitoken
+  range: LastDay # optional, defaults to LastHour
+```
+
+#### API Key
+
+This can be generated via the Technitium DNS Dashboard, and should be generated from a special API specific user.
+
+#### Range
+
+`range` value determines how far back of statistics to pull data for. The value comes directly from Technitium API documentation found [here](https://github.com/TechnitiumSoftware/DnsServer/blob/master/APIDOCS.md#dashboard-api-calls), defined as `"type"`. The value can be one of: `LastHour`, `LastDay`, `LastWeek`, `LastMonth`, `LastYear`.
+
+**NOTE:** The value of `Custom` as specified in the API documentation is _NOT_ supported.