Fix broken Transifex link (v28.2, v29.0)

Author: joetor5

_releases/v28.2.md

@@ -118,7 +118,7 @@ Thanks to everyone who directly contributed to this release:
 - Sjors Provoost
 
 As well as to everyone that helped with translations on
-[Transifex](https://www.transifex.com/bitcoin/bitcoin/).
+[Transifex](https://explore.transifex.com/bitcoin/bitcoin/).
 {% endgithubify %}
 
 </div>

_releases/v29.0.md

@@ -301,7 +301,7 @@ Thanks to everyone who directly contributed to this release:
 - yancy
 
 As well as to everyone that helped with translations on
-[Transifex](https://www.transifex.com/bitcoin/bitcoin/).
+[Transifex](https://explore.transifex.com/bitcoin/bitcoin/).
 {% endgithubify %}
 
 </div>