Add backend translation support for selector select (#15064)

* Base for selector translations

* Allow translations for ha-selector-select

* Fetch translation for config flow and onboarding

* Get translation_key from step handler

* Add domain property to DataEntry flow

* Revert fetching translation for onboarding flow

* Leave domain for repair flows

* Use localizeValue function

* Change type

* Import selector translations in issue flow

Co-authored-by: Paul Bottein <paul.bottein@gmail.com>

src/dialogs/config-flow/step-flow-form.ts

@@ -57,6 +57,7 @@ class StepFlowForm extends LitElement {
           .computeLabel=${this._labelCallback}
           .computeHelper=${this._helperCallback}
           .computeError=${this._errorCallback}
+          .localizeValue=${this._localizeValueCallback}
         ></ha-form>
       </div>
       <div class="buttons">
@@ -174,6 +175,13 @@ class StepFlowForm extends LitElement {
   private _errorCallback = (error: string) =>
     this.flowConfig.renderShowFormStepFieldError(this.hass, this.step, error);
 
+  private _localizeValueCallback = (key: string) =>
+    this.flowConfig.renderShowFormStepFieldLocalizeValue(
+      this.hass,
+      this.step,
+      key
+    );
+
   static get styles(): CSSResultGroup {
     return [
       configFlowContentStyles,