clarified password requirements

uffd/selfservice/templates/self.html

@@ -33,7 +33,7 @@
 		<label for="user-password1">Password</label>
 		<input type="password" class="form-control" id="user-password1" name="password1" placeholder="●●●●●●●●">
 		<small class="form-text text-muted">
-			At least 8 characters, no other special requirements. But please don't be stupid and use a password manager.
+			At least 8 and at most 256 characters, no other special requirements. But please don't be stupid, do use a password manager.
 		</small>
 	</div>
 	<div class="form-group col-md-6">

uffd/selfservice/templates/set_password.html

@@ -14,7 +14,7 @@
 			<label for="user-password1">New Password</label>
 			<input type="password" class="form-control" id="user-password1" name="password1" required="required" tabindex = "2">
 			<small class="form-text text-muted">
-				At least 8 and at most 256 characters, no other special requirements. But please don't be stupid and use a password manager.
+				At least 8 and at most 256 characters, no other special requirements. But please don't be stupid, do use a password manager.
 			</small>
 		</div>
 		<div class="form-group col-12">

uffd/user/templates/user.html

@@ -63,7 +63,7 @@
 				<input type="password" class="form-control" id="user-password" name="password" placeholder="mail to set it will be sent" readonly>
 				{% endif %}
 				<small class="form-text text-muted">
-					At least 8 and at most 256 characters, no other special requirements. But please don't be stupid and use a password manager.
+					At least 8 and at most 256 characters, no other special requirements. But please don't be stupid, do use a password manager.
 				</small>
 			</div>
 		</div>