Fix referer escaping

src/invidious/views/clear_watch_history.ecr

@@ -13,7 +13,7 @@
                 </button>
             </div>
             <div class="pure-u-1-2">
-                <a class="pure-button" href="<%= referer %>">
+                <a class="pure-button" href="<%= URI.escape(referer) %>">
                     <%= translate(locale, "No") %>
                 </a>
             </div>

src/invidious/views/data_control.ecr

@@ -3,7 +3,7 @@
 <% end %>
 
 <div class="h-box">
-    <form class="pure-form pure-form-aligned" enctype="multipart/form-data" action="/data_control?referer=<%= referer %>" method="post">
+    <form class="pure-form pure-form-aligned" enctype="multipart/form-data" action="/data_control?referer=<%= URI.escape(referer) %>" method="post">
         <fieldset>
             <legend><%= translate(locale, "Import") %></legend>
 

src/invidious/views/delete_account.ecr

@@ -13,7 +13,7 @@
                 </button>
             </div>
             <div class="pure-u-1-2">
-                <a class="pure-button" href="<%= referer %>">
+                <a class="pure-button" href="<%= URI.escape(referer) %>">
                     <%= translate(locale, "No") %>
                 </a>
             </div>

src/invidious/views/preferences.ecr

@@ -9,7 +9,7 @@ function update_value(element) {
 </script>
 
 <div class="h-box">
-    <form class="pure-form pure-form-aligned" action="/preferences?referer=<%= referer %>" method="post">
+    <form class="pure-form pure-form-aligned" action="/preferences?referer=<%= URI.escape(referer) %>" method="post">
         <fieldset>
             <legend><%= translate(locale, "Player preferences") %></legend>
 

src/invidious/views/subscription_manager.ecr

@@ -19,7 +19,7 @@
     </div>
     <div class="pure-u-1-3" style="text-align:right">
         <h3>
-            <a href="/data_control?referer=<%= referer %>">
+            <a href="/data_control?referer=<%= URI.escape(referer) %>">
                 <%= translate(locale, "Import/export") %>
             </a>
         </h3>

src/invidious/views/token_manager.ecr

@@ -11,7 +11,7 @@
     <div class="pure-u-1-3"></div>
     <div class="pure-u-1-3" style="text-align:right">
         <h3>
-            <a href="/preferences?referer=<%= referer %>"><%= translate(locale, "Preferences") %></a>
+            <a href="/preferences?referer=<%= URI.escape(referer) %>"><%= translate(locale, "Preferences") %></a>
         </h3>
     </div>
 </div>