diff --git a/go.mod b/go.mod
index ee2ce497436..df37a22dcc6 100644
--- a/go.mod
+++ b/go.mod
@@ -27,7 +27,7 @@ require (
 	github.com/gobwas/glob v0.2.3
 	github.com/gohugoio/go-i18n/v2 v2.1.3-0.20210430103248-4c28c89f8013
 	github.com/gohugoio/locales v0.14.0
-	github.com/gohugoio/localescompressed v0.14.0
+	github.com/gohugoio/localescompressed v0.15.0
 	github.com/gohugoio/testmodBuilder/mods v0.0.0-20190520184928-c56af20f2e95
 	github.com/google/go-cmp v0.5.6
 	github.com/gorilla/websocket v1.4.2
@@ -63,7 +63,7 @@ require (
 	golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 	golang.org/x/text v0.3.7
-	golang.org/x/tools v0.1.9 // indirect
+	golang.org/x/tools v0.1.9
 	google.golang.org/api v0.63.0
 	gopkg.in/yaml.v2 v2.4.0
 )
diff --git a/go.sum b/go.sum
index dd8e6eff6a4..e4bdfa05d93 100644
--- a/go.sum
+++ b/go.sum
@@ -111,8 +111,6 @@ github.com/akavel/rsrc v0.8.0/go.mod h1:uLoCtb9J+EyAqh+26kdrTgmzRBFPGOolLWKpdxkK
 github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38/go.mod h1:r7bzyVFMNntcxPZXK3/+KdruV1H5KSlyVY0gc+NgInI=
 github.com/alecthomas/chroma v0.7.2-0.20200305040604-4f3623dce67a/go.mod h1:fv5SzZPFJbwp2NXJWpFIX7DZS4HgV1K4ew4Pc2OZD9s=
 github.com/alecthomas/chroma v0.8.2/go.mod h1:sko8vR34/90zvl5QdcUdvzL3J8NKjAUx9va9jPuFNoM=
-github.com/alecthomas/chroma v0.9.4 h1:YL7sOAE3p8HS96T9km7RgvmsZIctqbK1qJ0b7hzed44=
-github.com/alecthomas/chroma v0.9.4/go.mod h1:jtJATyUxlIORhUOFNA9NZDWGAQ8wpxQQqNSB4rjA/1s=
 github.com/alecthomas/chroma v0.10.0 h1:7XDcGkCQopCNKjZHfYrNLraA+M7e0fMiJ/Mfikbfjek=
 github.com/alecthomas/chroma v0.10.0/go.mod h1:jtJATyUxlIORhUOFNA9NZDWGAQ8wpxQQqNSB4rjA/1s=
 github.com/alecthomas/colour v0.0.0-20160524082231-60882d9e2721/go.mod h1:QO9JBoKquHd+jz9nshCh40fOfO+JzsoXy8qTHF68zU0=
@@ -227,8 +225,6 @@ github.com/envoyproxy/go-control-plane v0.10.1/go.mod h1:AY7fTTXNdv/aJ2O5jwpxAPO
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/envoyproxy/protoc-gen-validate v0.6.2 h1:JiO+kJTpmYGjEodY7O1Zk8oZcNz1+f30UtwtXoFUPzE=
 github.com/envoyproxy/protoc-gen-validate v0.6.2/go.mod h1:2t7qjJNvHPx8IjnBOzl9E9/baC+qXE/TeeyBRzgJDws=
-github.com/evanw/esbuild v0.14.11 h1:bw50N4v70Dqf/B6Wn+3BM6BVttz4A6tHn8m8Ydj9vxk=
-github.com/evanw/esbuild v0.14.11/go.mod h1:GG+zjdi59yh3ehDn4ZWfPcATxjPDUH53iU4ZJbp7dkY=
 github.com/evanw/esbuild v0.14.22 h1:XAP8PsfWJtxyPRBmh6slpSPZbAlClk/MCVPw7qGuC4Q=
 github.com/evanw/esbuild v0.14.22/go.mod h1:GG+zjdi59yh3ehDn4ZWfPcATxjPDUH53iU4ZJbp7dkY=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
@@ -275,8 +271,8 @@ github.com/gohugoio/go-i18n/v2 v2.1.3-0.20210430103248-4c28c89f8013 h1:Nj29Qbkt0
 github.com/gohugoio/go-i18n/v2 v2.1.3-0.20210430103248-4c28c89f8013/go.mod h1:3Ltoo9Banwq0gOtcOwxuHG6omk+AwsQPADyw2vQYOJQ=
 github.com/gohugoio/locales v0.14.0 h1:Q0gpsZwfv7ATHMbcTNepFd59H7GoykzWJIxi113XGDc=
 github.com/gohugoio/locales v0.14.0/go.mod h1:ip8cCAv/cnmVLzzXtiTpPwgJ4xhKZranqNqtoIu0b/4=
-github.com/gohugoio/localescompressed v0.14.0 h1:gP4zzgfF3NFr2rNzwxReD/tDXz98pAGVmrPy3ZCLRDc=
-github.com/gohugoio/localescompressed v0.14.0/go.mod h1:jBF6q8D7a0vaEmcWPNcAjUZLJaIVNiwvM3WlmTvooB0=
+github.com/gohugoio/localescompressed v0.15.0 h1:KG+mPzRdPs7eklbZ7KsIikzwvd4wcyA9vv2MniUrFQ8=
+github.com/gohugoio/localescompressed v0.15.0/go.mod h1:jBF6q8D7a0vaEmcWPNcAjUZLJaIVNiwvM3WlmTvooB0=
 github.com/gohugoio/testmodBuilder/mods v0.0.0-20190520184928-c56af20f2e95 h1:sgew0XCnZwnzpWxTt3V8LLiCO7OQi3C6dycaE67wfkU=
 github.com/gohugoio/testmodBuilder/mods v0.0.0-20190520184928-c56af20f2e95/go.mod h1:bOlVlCa1/RajcHpXkrUXPSHB/Re1UnlXxD1Qp8SKOd8=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
@@ -748,7 +744,6 @@ golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96b
 golang.org/x/net v0.0.0-20210410081132-afb366fc7cd1/go.mod h1:9tjilg8BloeKEkVJvy7fQ90B1CfIiPueXVOjqfkSzI8=
 golang.org/x/net v0.0.0-20210503060351-7fd8e65b6420/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20210614182718-04defd469f4e/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d h1:LO7XpTYMwTqxjLcGWPijK3vRXg1aWdlNOVOHRq45d7c=
 golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f h1:OfiFi4JbukWwe3lzw+xunroH1mnC1e2Gy5cxNJApiSY=
 golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
diff --git a/tpl/lang/lang_test.go b/tpl/lang/lang_test.go
index 3a1f66df74a..8d5430f6f0e 100644
--- a/tpl/lang/lang_test.go
+++ b/tpl/lang/lang_test.go
@@ -3,9 +3,9 @@ package lang
 import (
 	"testing"
 
-	translators "github.com/gohugoio/localescompressed"
 	qt "github.com/frankban/quicktest"
 	"github.com/gohugoio/hugo/deps"
+	translators "github.com/gohugoio/localescompressed"
 )
 
 func TestNumFmt(t *testing.T) {
@@ -105,3 +105,36 @@ func TestFormatNumbers(t *testing.T) {
 	})
 
 }
+
+// Issue 9446
+func TestLanguageKeyFormat(t *testing.T) {
+
+	c := qt.New(t)
+
+	nsUnderscoreUpper := New(&deps.Deps{}, translators.GetTranslator("es_ES"))
+	nsUnderscoreLower := New(&deps.Deps{}, translators.GetTranslator("es_es"))
+	nsHyphenUpper := New(&deps.Deps{}, translators.GetTranslator("es-ES"))
+	nsHyphenLower := New(&deps.Deps{}, translators.GetTranslator("es-es"))
+	pi := 3.14159265359
+
+	c.Run("FormatNumber", func(c *qt.C) {
+		c.Parallel()
+		got, err := nsUnderscoreUpper.FormatNumber(3, pi)
+		c.Assert(err, qt.IsNil)
+		c.Assert(got, qt.Equals, "3,142")
+
+		got, err = nsUnderscoreLower.FormatNumber(3, pi)
+		c.Assert(err, qt.IsNil)
+		c.Assert(got, qt.Equals, "3,142")
+
+		got, err = nsHyphenUpper.FormatNumber(3, pi)
+		c.Assert(err, qt.IsNil)
+		c.Assert(got, qt.Equals, "3,142")
+
+		got, err = nsHyphenLower.FormatNumber(3, pi)
+		c.Assert(err, qt.IsNil)
+		c.Assert(got, qt.Equals, "3,142")
+
+	})
+
+}