Fix AI assistant sources (baserow#4779)

Author: bram2w

enterprise/web-frontend/modules/baserow_enterprise/components/assistant/AssistantMessageSources.vue

@@ -8,7 +8,7 @@
       <i class="iconoir-book-stack assistant__sources-icon"></i>
       <span class="assistant__sources-label">
         {{
-          $tc('assistantMessageSources.sources', sources.length, {
+          $t('assistantMessageSources.sources', sources.length, {
             count: sources.length,
           })
         }}