i18n: translation updates from weblate

Co-authored-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
Co-authored-by: Hosted Weblate <hosted@weblate.org>
Co-authored-by: Jim Spentzos <jimspentzos2000@gmail.com>
Co-authored-by: Nara Díaz Viñolas <nara.diaz.vinolas@gmail.com>
Co-authored-by: Марко М. Костић <marko.m.kostic@gmail.com>
Translate-URL: https://hosted.weblate.org/projects/pop-os/cosmic-bg/ca/
Translate-URL: https://hosted.weblate.org/projects/pop-os/cosmic-bg/el/
Translate-URL: https://hosted.weblate.org/projects/pop-os/cosmic-bg/sr/
Translation: Pop OS/COSMIC Background

Author: 5 people

i18n/ca/cosmic_bg.ftl

@@ -0,0 +1,2 @@
+app-name = Fons de Pantalla del COSMIC
+translator-credits = Adolfo Jayme Barrientos, Nara Díaz Viñolas

i18n/el/cosmic_bg.ftl

@@ -0,0 +1,4 @@
+app-name = Φόντο COSMIC
+translator-credits =
+    Κωνσταντίνος Λαμπρόπουλος
+    Δημήτρης Σπέντζος

i18n/sr/cosmic_bg.ftl

@@ -0,0 +1,2 @@
+app-name = КОСМИК позадине
+translator-credits = Ashley Wulber