/account/activate: fix grammar in English version of the message.

Author: php-coder

src/main/resources/ru/mystamps/i18n/Messages.properties

@@ -54,7 +54,7 @@ t_if_you_already_registered = If you already registered then you should pass <a
 t_email = E-mail
 
 # account/activate.html
-t_activation_sent_message = Instructions to finish registration has been sent to your e-mail
+t_activation_sent_message = Instructions to finish registration have been sent to your e-mail
 t_already_activated = You have already activated account.
 t_activation_title = account activation
 t_activation_on_site = Account activation

src/main/webapp/WEB-INF/views/account/activate.html

@@ -104,7 +104,7 @@ <h3 th:text="#{t_activation_on_site}">
 						<!--/*/
 						<div class="row" th:if="${justRegisteredUser}">
 							<div class="alert alert-success text-center" th:text="#{t_activation_sent_message}">
-								Instructions to finish registration has been sent to your e-mail
+								Instructions to finish registration have been sent to your e-mail
 							</div>
 						</div>
 						/*/-->