fix(studio): localize sidebar tooltips that stayed English

The connection-row tooltip, the _ConnectionLabel caption,
the footer settings tooltip, and the channel-pill explainer
were hardcoded English even when the running app was set to
German. Move all four through AppLocalizations.

Adds ARB strings (de + en):
 - connectionTapToStart      antippen zum Starten  / tap to start
 - sidebarSettingsTooltip    Einstellungen (Cmd-;) / Settings (Cmd-;)
 - sidebarChannelTooltip     multi-line channel explainer

Existing connectionConnected / connectionUnreachable /
connectionConnecting are reused as the caption pieces; only
those two new strings (plus the channel tooltip) needed
adding.

Version 0.51.7 -> 0.51.8.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/l10n/app_de.arb

@@ -62,6 +62,9 @@
   "connectionUnreachable": "nicht erreichbar",
   "connectionConnecting": "verbinde…",
   "connectionStartHub": "Hub starten",
+  "connectionTapToStart": "antippen zum Starten",
+  "sidebarSettingsTooltip": "Einstellungen (⌘;)",
+  "sidebarChannelTooltip": "Aktiver Kanal — klicken um in Einstellungen (⌘;) zu wechseln.\nproduction = stabil · beta = Vorabversion · dev = laufend · local = Arbeitsumgebung",
   "buttonCancel": "Abbrechen",
   "buttonSave": "Speichern",
   "buttonClose": "Schließen",

lib/l10n/app_en.arb

@@ -65,6 +65,9 @@
   "connectionUnreachable": "unreachable",
   "connectionConnecting": "connecting…",
   "connectionStartHub": "Start hub",
+  "connectionTapToStart": "tap to start",
+  "sidebarSettingsTooltip": "Settings (⌘;)",
+  "sidebarChannelTooltip": "Active channel — click to switch in Settings (⌘;).\nproduction = stable · beta = pre-release · dev = rolling · local = workspace",
   "buttonCancel": "Cancel",
   "buttonSave": "Save",
   "buttonClose": "Close",

lib/l10n/app_localizations.dart

@@ -428,6 +428,24 @@ abstract class AppLocalizations {
   /// **'Start hub'**
   String get connectionStartHub;
 
+  /// No description provided for @connectionTapToStart.
+  ///
+  /// In en, this message translates to:
+  /// **'tap to start'**
+  String get connectionTapToStart;
+
+  /// No description provided for @sidebarSettingsTooltip.
+  ///
+  /// In en, this message translates to:
+  /// **'Settings (⌘;)'**
+  String get sidebarSettingsTooltip;
+
+  /// No description provided for @sidebarChannelTooltip.
+  ///
+  /// In en, this message translates to:
+  /// **'Active channel — click to switch in Settings (⌘;).\nproduction = stable · beta = pre-release · dev = rolling · local = workspace'**
+  String get sidebarChannelTooltip;
+
   /// No description provided for @buttonCancel.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_de.dart

@@ -192,6 +192,16 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get connectionStartHub => 'Hub starten';
 
+  @override
+  String get connectionTapToStart => 'antippen zum Starten';
+
+  @override
+  String get sidebarSettingsTooltip => 'Einstellungen (⌘;)';
+
+  @override
+  String get sidebarChannelTooltip =>
+      'Aktiver Kanal — klicken um in Einstellungen (⌘;) zu wechseln.\nproduction = stabil · beta = Vorabversion · dev = laufend · local = Arbeitsumgebung';
+
   @override
   String get buttonCancel => 'Abbrechen';
 

lib/l10n/app_localizations_en.dart

@@ -192,6 +192,16 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get connectionStartHub => 'Start hub';
 
+  @override
+  String get connectionTapToStart => 'tap to start';
+
+  @override
+  String get sidebarSettingsTooltip => 'Settings (⌘;)';
+
+  @override
+  String get sidebarChannelTooltip =>
+      'Active channel — click to switch in Settings (⌘;).\nproduction = stable · beta = pre-release · dev = rolling · local = workspace';
+
   @override
   String get buttonCancel => 'Cancel';