Change wording

docker-compose.yml

@@ -21,4 +21,4 @@ services:
     build:
       context: ../rust-captcha/docker
     restart: unless-stopped
-    
+    

templates/index.html

@@ -32,7 +32,7 @@
     </div>
     <input required type="text" name="captcha-solution">
     <input type="hidden" name="captcha-id" value="{{ captcha_id }}">
-    <button type="submit">Validate</button>
+    <button type="submit">Submit</button>
   </form>
   <p>Once you get the value of f(0), go to {{ domain }}/f(0)</p>