Update Flattr donation link and add generic PayPal donation link for currencies not already supported.

doc/chm/VeraCrypt.hhp

@@ -62,6 +62,7 @@ Digital Signatures.html
 Disclaimers.html
 Documentation.html
 Donation.html
+Donation_donate.gif
 Donation_donate_CHF.gif
 Donation_donate_Dollars.gif
 Donation_donate_Euros.gif

doc/html/Donation.html

@@ -56,6 +56,10 @@ <h3><img src="paypal_30x30.png" style="vertical-align: middle; margin-right: 5px
 </tbody>
 </table>
 
+<p>For other currencies, click on the button below and then select your currency using the drop-down list under the amount.</p>
+<a title="VeraCrypt Donation in any currency" href="https://www.paypal.me/idrix" target="_blank"><img src="Donation_donate.gif" alt="" width="92" height="26"></a>
+
+
 <hr>
 <h3><a href="Donation_Bank.html"><img src="bank_30x30.png" style="margin-right: 5px"></a>Bank Transfer</h3>
 <p>You can use <a href="Donation_Bank.html">IDRIX bank details available here</a> to send your donations using bank transfers.
@@ -64,7 +68,7 @@ <h3><a href="Donation_Bank.html"><img src="bank_30x30.png" style="margin-right:
 <h3>Donation Platforms:</h3>
 <ul>
 <li><strong>Liberapay: <a href="https://liberapay.com/VeraCrypt/donate" target="_blank"><img alt="Donate using Liberapay" src="liberapay_donate.svg" style="vertical-align: middle; margin-bottom: 5px"></a></strong></li>
-<li><strong>Flattr: <a title="Donate using Flattr" href="https://flattr.com/submit/auto?user_id=idrix&url=https://www.veracrypt.fr&title=VeraCrypt" target="_blank"><img title="Flattr VeraCrypt" src="flattr-badge-large.png" alt="Flattr VeraCrypt" width="93" height="20" border="0" style="vertical-align: middle; margin-bottom: 5px"></a></strong></li>
+<li><strong>Flattr: <a title="Donate using Flattr" href="https://flattr.com/domain/veracrypt.fr" target="_blank"><img title="Flattr VeraCrypt" src="flattr-badge-large.png" alt="Flattr VeraCrypt" width="93" height="20" border="0" style="vertical-align: middle; margin-bottom: 5px"></a></strong></li>
 </ul>
 
 <hr>