[Contribution] new UI language (galician)

[xmgz]

Hi,

thank you for your work with Spotiflyer

I've translated Spotiflyer's user interface to galician language.

International language code is "gl", but some android versions use "gl_ES" (Galicia is a Spanish region but it is not a spanish language variant). So please consider using "gl". Thank you!

[BobbyESP]

Grande o galegooo! Jajaja

[xmgz]

please consider adding galician language, thank you