Update translations, add Czech

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

...top/src/main/resources/strings/BriarDesktop_bg.properties

...top/src/main/resources/strings/BriarDesktop_ca.properties

...top/src/main/resources/strings/BriarDesktop_cs.properties

...top/src/main/resources/strings/BriarDesktop_de.properties

...top/src/main/resources/strings/BriarDesktop_es.properties

...top/src/main/resources/strings/BriarDesktop_fa.properties

...top/src/main/resources/strings/BriarDesktop_fr.properties

...top/src/main/resources/strings/BriarDesktop_gl.properties

...top/src/main/resources/strings/BriarDesktop_hu.properties

...top/src/main/resources/strings/BriarDesktop_is.properties

...top/src/main/resources/strings/BriarDesktop_it.properties

...top/src/main/resources/strings/BriarDesktop_ja.properties

...top/src/main/resources/strings/BriarDesktop_ka.properties

...top/src/main/resources/strings/BriarDesktop_lt.properties

...top/src/main/resources/strings/BriarDesktop_my.properties

...top/src/main/resources/strings/BriarDesktop_nb.properties

...top/src/main/resources/strings/BriarDesktop_pl.properties

.../src/main/resources/strings/BriarDesktop_pt_BR.properties

...top/src/main/resources/strings/BriarDesktop_ro.properties