Add LanguageSwitch system object for real-time i18n refresh of all SQLText nodes

[Copilot]

This change implements a runtime language switch control (pulldown + apply button) and wires it to refresh all sysObjSQLText instances immediately. Selecting a language and applying it now updates on-screen multilingual text without reload.

• New runtime object: LanguageSwitch

  • Added sysObjLanguageSwitch (www/sysObjLanguageSwitch.js).
  • Renders a FormfieldPulldown for language selection and a callback button to apply.
  • Supports default options from sysFactory.ObjText.Languages and optional config overrides for pulldown/button attributes.

• Global SQLText refresh path

  • Extended sysFactory with:
    • SQLTextObjects registry
    • registerSQLTextObject(SQLTextObject)
    • updateAllSQLTextObjects()
  • updateAllSQLTextObjects() calls update() + setDOMElementValue() on every registered SQLText object.

• SQLText auto-registration

  • Updated sysObjSQLText.init() to register each instance with the factory registry so global refresh reaches all instances, including nested/runtime-created ones.

• Object wiring / bootstrap

  • Registered "LanguageSwitch": sysObjLanguageSwitch in sysFactory.SetupClasses.
  • Added /sysObjLanguageSwitch.js script include in python/Index.py.

• Documentation

  • Added sysObjLanguageSwitch class entry to doc/dev-oop-classes.rst.

// core refresh flow introduced by this PR
sysObjLanguageSwitch.prototype.updateLanguage = function()
{
    const PulldownObj = this.getObjectByID(this.PulldownObjectID);
    sysFactory.EnvUserLanguage = PulldownObj.getValue();
    sysFactory.updateAllSQLTextObjects();
}

[clauspruefer]

@copilot sysFactory.js does not need the this.SQLTextObjects Array. All SQLTextObjects can be retrieved by sysBaseObject.getObjectsByType(ObjectType);

[Copilot]

@copilot sysFactory.js does not need the this.SQLTextObjects Array. All SQLTextObjects can be retrieved by sysBaseObject.getObjectsByType(ObjectType);

Done in 3200eae. I removed the SQLTextObjects array and registerSQLTextObject() from sysFactory, removed SQLText self-registration in sysObjSQLText.init(), and updated updateAllSQLTextObjects() to collect SQLText instances via HierarchyRootObject.getObjectsByType('SQLText') for each screen.