docs: unify documentation and streamline code comments

- Translated project documentation (LEARNING-JOURNEY, CONTRIBUTORS, AI_DISCLOSURE) to English for better accessibility.
- Standardized internal code documentation by converting XML-doc blocks to standard comment format.
- Cleaned up inline comments and removed redundant versioning metadata across the codebase.
- Refactored non-functional text elements to improve readability and maintain a consistent style.

HellionChat/Ui/SettingsTabs/Tabs.cs

@@ -123,7 +123,7 @@ internal sealed class Tabs : ISettingsTab
                 ImGuiInputTextFlags.EnterReturnsTrue
             );
 
-            // v1.2.0 — Per-Tab Icon-Override. Default-Mapping greift falls nichts gesetzt.
+            // Per-tab icon override added in v1.2.0. Falls back to default mapping if unset.
             ImGui.TextUnformatted(HellionStrings.Tabs_Icon_Label);
             ImGui.SameLine();
             ImGuiUtil.HelpMarker(HellionStrings.Tabs_Icon_HelpMarker);
@@ -135,7 +135,7 @@ internal sealed class Tabs : ISettingsTab
             {
                 if (combo.Success)
                 {
-                    // Erste Option: Default (löscht Icon, lässt Mapping greifen).
+                    // First option clears the icon and lets the default mapping take over.
                     if (
                         ImGui.Selectable(
                             HellionStrings.Tabs_Icon_DefaultOption,
@@ -148,7 +148,7 @@ internal sealed class Tabs : ISettingsTab
 
                     ImGui.Separator();
 
-                    // Pool-Optionen aus TabIconGlyphResolver.PickerOptions (Single-Source-of-Truth).
+                    // Options sourced from TabIconGlyphResolver.PickerOptions (single source of truth).
                     foreach (var option in TabIconGlyphResolver.PickerOptions)
                     {
                         var isSelected = string.Equals(
@@ -305,10 +305,8 @@ internal sealed class Tabs : ISettingsTab
 
                         ImGui.SameLine();
 
-                        // Guard against an empty worlds list — can happen briefly
-                        // when switching characters or if the datacenter sheet
-                        // has not yet populated. Without the guard the indexed
-                        // access into worlds[selectedWorld] would crash.
+                        // Guard against an empty worlds list (character switch or sheet not yet populated)
+                        // to avoid an out-of-bounds crash on worlds[selectedWorld].
                         if (worlds.Count == 0)
                         {
                             ImGui.TextDisabled("(no worlds available)");