3.7.90
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* Updates to Python demos (Marta Maria Casetti)
* Fixed incorrect value in Guitar Tuner demo, #687628 (Tiffany Antopolski)
* Various typo fixes (Daniel Mustieles)
* Updated translations:
 el    (Tom Tryfonidis, Dimitris Spingos)
 es    (Nicolás Satragno, Daniel Mustieles)
 pt_BR (Enrico Nicoletto)