ui: Handle exercice authors

frontend/ui/src/routes/[theme]/+layout.svelte

@@ -11,14 +11,22 @@
  import { current_theme } from '$lib/stores/themes';
 
  let heading_image = "";
+ let current_authors = "";
  $: if ($current_theme) {
      if ($current_exercice && $current_exercice.image) {
          heading_image = $current_exercice.image;
      } else {
          heading_image = $current_theme.image;
      }
+
+     if ($current_exercice && $current_exercice.authors) {
+         current_authors = $current_exercice.authors;
+     } else {
+         current_authors = $current_theme.authors;
+     }
  } else {
      heading_image = "";
+     current_authors = "";
  }
 </script>
 
@@ -44,7 +52,7 @@
 	    <h1 class="display-2">
                 <a href="{$current_theme.urlid}">{$current_theme.name}</a>
             </h1>
-	    <h2>{@html $current_theme.authors}</h2>
+	    <h2>{@html current_authors}</h2>
         </Container>
         <div class="headerfade"></div>
     </div>

libfic/theme_export.go

@@ -12,6 +12,7 @@ var GlobalScoreCoefficient float64 = 1
 type exportedExercice struct {
 	Id       int64    `json:"id"`
 	Title    string   `json:"title"`
+	Authors  string   `json:"authors,omitempty"`
 	Headline string   `json:"headline,omitempty"`
 	Image    string   `json:"image,omitempty"`
 	URLId    string   `json:"urlid"`
@@ -63,6 +64,7 @@ func ExportThemes() (interface{}, error) {
 					exos = append(exos, exportedExercice{
 						exercice.Id,
 						exercice.Title,
+						exercice.Authors,
 						exercice.Headline,
 						exoimgpath,
 						exercice.URLId,