update translations from Transifex, add Catalan (ca)

...riarproject/briar/desktop/settings/UnencryptedSettings.kt

src/main/resources/strings/BriarDesktop_ar.properties

src/main/resources/strings/BriarDesktop_bg.properties

src/main/resources/strings/BriarDesktop_ca.properties

src/main/resources/strings/BriarDesktop_de.properties

src/main/resources/strings/BriarDesktop_es.properties

src/main/resources/strings/BriarDesktop_fa.properties

src/main/resources/strings/BriarDesktop_fr.properties

src/main/resources/strings/BriarDesktop_gl.properties

src/main/resources/strings/BriarDesktop_he.properties

src/main/resources/strings/BriarDesktop_hu.properties

src/main/resources/strings/BriarDesktop_is.properties

src/main/resources/strings/BriarDesktop_it.properties

src/main/resources/strings/BriarDesktop_ja.properties

src/main/resources/strings/BriarDesktop_ko.properties

src/main/resources/strings/BriarDesktop_lt.properties

src/main/resources/strings/BriarDesktop_my.properties

src/main/resources/strings/BriarDesktop_nl.properties

src/main/resources/strings/BriarDesktop_pl.properties

src/main/resources/strings/BriarDesktop_pt_BR.properties