Qt: Add Dutch translation by @DenSinH

CONTRIBUTORS.md

@@ -15,6 +15,7 @@ The following people have contributed to the project in some way, and are credit
 - Hipnosis183 - Spanish
 - @RaydenX93 - Italian
 - @r57zone - Russian
+- @DenSinH - Dutch
 
 ## Game Compatibility Database
  - @Zet-sensei

src/duckstation-qt/duckstation-qt.vcxproj

@@ -246,6 +246,7 @@
   <ItemGroup>
     <None Include="translations\duckstation-qt_es.ts" />
     <None Include="translations\duckstation-qt_it.ts" />
+    <None Include="translations\duckstation-qt_nl.ts" />
     <None Include="translations\duckstation-qt_ru.ts" />
   </ItemGroup>
   <Target Name="CopyCommonDataFiles" AfterTargets="Build" Inputs="@(CommonDataFiles)" Outputs="@(CommonDataFiles -> '$(BinaryOutputDir)%(RecursiveDir)%(Filename)%(Extension)')">

src/duckstation-qt/duckstation-qt.vcxproj.filters

@@ -159,6 +159,9 @@
     <None Include="translations\duckstation-qt_ru.ts">
       <Filter>translations</Filter>
     </None>
+    <None Include="translations\duckstation-qt_nl.ts">
+      <Filter>translations</Filter>
+    </None>
   </ItemGroup>
   <ItemGroup>
     <QtResource Include="resources\resources.qrc">

src/duckstation-qt/qthostinterface.cpp

@@ -64,6 +64,7 @@ std::vector<std::pair<QString, QString>> QtHostInterface::getAvailableLanguageLi
           {QStringLiteral("Español"), QStringLiteral("es")},
           {QStringLiteral("עברית"), QStringLiteral("he")},
           {QStringLiteral("Italiano"), QStringLiteral("it")},
+          {QStringLiteral("Nederlands"), QStringLiteral("nl")},
           {QStringLiteral("Português (Pt)"), QStringLiteral("pt-pt")},
           {QStringLiteral("Português (Br)"), QStringLiteral("pt-br")},
           {QStringLiteral("Русский"), QStringLiteral("ru")},