link directly to the encryption settings

apps/files_encryption/templates/invalid_private_key.php

 <ul>
 	<li class='error'>
-		<?php $location = \OC_Helper::linkToRoute( "settings_personal" ) ?>
+		<?php $location = \OC_Helper::linkToRoute( "settings_personal" ).'#changePKPasswd' ?>
 
 		<?php p($l->t('Your private key is not valid! Maybe the your password was changed from outside.')); ?>
 		<br/>

apps/files_encryption/templates/settings-personal.php

@@ -6,6 +6,7 @@
 
 		<?php if ( ! $_["privateKeySet"] ): ?>
 			<p>
+				<a name="changePKPasswd" />
 				<label for="changePrivateKeyPasswd"><?php p( $l->t( "Your private key password no longer match your log-in password:" ) ); ?></label>
 				<br />
 				<em><?php p( $l->t( "Set your old private key password to your current log-in password." ) ); ?></em>