update Contributors list

README.MD

@@ -248,7 +248,9 @@ See https://github.com/gildas-lormeau/SingleFile/blob/master/privacy.md
 - Japanese translation done by Shitennouji（四天王寺)
   (https://github.com/Shitennouji)
 - Polish translation done by xesarni (https://github.com/xesarni)
-- Portuguese-Brazilian translation done by @mezysinc
+- Portuguese translation done by Blackspirits (https://github.com/Blackspirits)
+- Portuguese-Brazilian translation done by @mezysinc, Blackspirits
+  (https://github.com/Blackspirits)
 - Russian translation done by rstp14, kramola-RU
   (https://github.com/kramola-RU), solokot (https://github.com/solokot),
   TotalCaesar659 (https://github.com/TotalCaesar659)

src/ui/pages/help.html

@@ -1174,7 +1174,11 @@
 					<li>Polish translation done by xesarni (<a href="https://github.com/xesarni" target="_blank">GitHub
 							profile</a>)
 					</li>
-					<li>Portuguese-Brazilian translation done by @mezysinc
+					<li>Portuguese translation done by @Blackspirits (<a href="https://github.com/Blackspirit" 
+						target="_blank">GitHub profile</a>)
+					</li>
+					<li>Portuguese-Brazilian translation done by @mezysinc, Blackspirits (<a href="https://github.com/Blackspirit" 
+						target="_blank">GitHub profile</a>)
 					</li>
 					<li>Russian translation done by rstp14 (<a href="https://github.com/rstp14" target="_blank">GitHub
 							profile</a>), kramola-RU (<a href="https://github.com/kramola-RU" target="_blank">GitHub