all: Correct various typos

Skip-check: authors

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4005

cmd/strelaypoolsrv/gui/index.html

@@ -48,7 +48,7 @@
           </p>
         </div>
         <div id="map"></div> <!-- Can't hide the map, otherwise it freaks out -->
-        <p>The circle size represents how much bytes the relay transfered relative to other relays</p>
+        <p>The circle size represents how much bytes the relay transferred relative to other relays</p>
       </div>
       <div>
         <table class="table table-striped table-condensed table">