Added en-GB and de-DE

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

src/languages.rs

@@ -0,0 +1,2 @@
+pub static EN_GB: &str = include_str!("./languages/en-GB.json");
+pub static DE_DE: &str = include_str!("./languages/de-DE.json");