ibus-engines.typing-booster: support french by default

This has been postponed[1] because of an unclear state of the french
dictionary provided by hunspell[2].

[1] https://github.com/NixOS/nixpkgs/pull/46779#issuecomment-422764601
[2] https://github.com/NixOS/nixpkgs/issues/46940#issuecomment-423288963

doc/package-notes.xml

@@ -494,7 +494,7 @@ stdenv.mkDerivation {
    <para>
     The IBus engine is based on <literal>hunspell</literal> to support
     completion in many languages. By default the dictionaries
-    <literal>de-de</literal>, <literal>en-us</literal>,
+    <literal>de-de</literal>, <literal>en-us</literal>, <literal>fr-moderne</literal>
     <literal>es-es</literal>, <literal>it-it</literal>,
     <literal>sv-se</literal> and <literal>sv-fi</literal> are in use. To add
     another dictionary, the package can be overridden like this:

pkgs/tools/inputmethods/ibus-engines/ibus-typing-booster/wrapper.nix

@@ -1,5 +1,5 @@
 { typing-booster, symlinkJoin, hunspellDicts, lib, makeWrapper
-, langs ? [ "de-de" "en-us" "es-es" "it-it" "sv-se" "sv-fi" ]
+, langs ? [ "de-de" "en-us" "es-es" "fr-moderne" "it-it" "sv-se" "sv-fi" ]
 }:
 
 let