Show year of logo starting usage if available, fixes #18.

Marechai/Marechai.csproj

@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
   <PropertyGroup>
     <TargetFramework>netcoreapp3.1</TargetFramework>
-    <Version>4.0.0.1784</Version>
+    <Version>4.0.0.1787</Version>
     <Company>Canary Islands Computer Museum</Company>
     <Copyright>Copyright © 2003-2020 Natalia Portillo</Copyright>
     <Product>Canary Islands Computer Museum Website</Product>

Marechai/Pages/Companies/View.razor

@@ -84,6 +84,10 @@
                              /assets/logos/png/1x/@(logo.Guid).webp 3x" src="/assets/logos/png/1x/@(logo.Guid).png" alt="" height="auto" width="auto" style="max-height: 256px; max-width: 256px" />
                         </picture>
                     </div>
+                    @if(logo.Year.HasValue)
+                    {
+                        <div style="text-align: center;">@(string.Format(L["in use since {0}"], logo.Year))</div>
+                    }
                 </CarouselSlide>
             }
         </Carousel>

Marechai/Resources/Services/CompaniesService.es.resx

@@ -530,4 +530,7 @@
     <value>Si el día o mes de la venta, fusión o bancarrota están marcados como desconocidos, elige cualquiera en el campo inferior, será ignorado.</value>
     <comment>If the sold, merge or bankruptcy day or month are selected as unknown, pick anyone in the field below, it will be ignored.</comment>
   </data>
+  <data name="in use since {0}" xml:space="preserve">
+    <value>en uso desde el {0}</value>
+  </data>
 </root>