adds trail author filter

web/src/lib/i18n/locales/en.json

@@ -18,10 +18,12 @@
   "already-account": "Already have an account?",
   "altitude": "Altitude",
   "api-documentation": "API Documentation",
+  "author": "Author",
   "avatar": "Avatar",
   "average-speed": "Avg. Speed",
   "basic-info": "Basic Info",
   "before": "Before",
+  "by": "by",
   "can": "can",
   "cancel": "Cancel",
   "card": "{n, plural, =1 {Card} other {Cards}}",
@@ -93,6 +95,7 @@
   "file-format": "File format",
   "file-too-big": "File {file} is too big (max. {size})",
   "filter-categories": "Filter categories",
+  "filter-difficulty": "Filter difficulty",
   "focus-map-on": "Focus map on",
   "french": "French",
   "german": "German",
@@ -182,6 +185,7 @@
   "share": "Share",
   "share-this-list": "Share this list",
   "share-this-trail": "Share this trail",
+  "shared": "Shared",
   "shared-by": "Shared by",
   "shared-with": "Shared with",
   "show-in-overview": "Show in overview",