Update wording on data control page for clarity

src/invidious/views/data_control.ecr

@@ -8,14 +8,14 @@
             <legend><%= translate(locale, "Import") %></legend>
 
             <div class="pure-control-group">
-                <label for="import_youtube"><%= translate(locale, "Import Invidious data") %></label>
+                <label for="import_youtube"><%= translate(locale, "Import Invidious JSON data") %></label>
                 <input type="file" id="import_invidious" name="import_invidious">
             </div>
 
             <div class="pure-control-group">
                 <label for="import_youtube">
                     <a rel="noopener" target="_blank" href="https://github.com/iv-org/documentation/blob/master/Export-YouTube-subscriptions.md">
-                        <%= translate(locale, "Import YouTube subscriptions") %>
+                        <%= translate(locale, "Import YouTube/OPML subscriptions") %>
                     </a>
                 </label>
                 <input type="file" id="import_youtube" name="import_youtube">
@@ -51,7 +51,7 @@
             </div>
 
             <div class="pure-control-group">
-                <a href="/subscription_manager?action_takeout=1&format=json"><%= translate(locale, "Export data as JSON") %></a>
+                <a href="/subscription_manager?action_takeout=1&format=json"><%= translate(locale, "Export Invidious data as JSON") %></a>
             </div>
         </fieldset>
     </form>