ripgrep: add .ignore file for po/ translations

hosts/common/home/default.nix

@@ -13,6 +13,7 @@
     ./mpv.nix
     ./neovim.nix
     ./newsflash.nix
+    ./ripgrep.nix
     ./splatmoji.nix
     ./ssh.nix
     ./sublime-music.nix

hosts/common/home/ripgrep.nix

@@ -0,0 +1,9 @@
+{ sane-lib, ... }:
+{
+  # .ignore file is read by ripgrep (rg), silver searcher (ag), maybe others.
+  # ignore translation files by default when searching, as they tend to have
+  # a LOT of duplicate text.
+  sane.user.fs.".ignore" = sane-lib.fs.wantedText ''
+    po/
+  '';
+}