Revert "Updated gRPC vendoring to support Keep Alive"

vendor/golang.org/x/text/language/language.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:generate go run gen.go gen_common.go -output tables.go
+//go:generate go run maketables.go gen_common.go -output tables.go
 //go:generate go run gen_index.go
 
 // Package language implements BCP 47 language tags and related functionality.
@@ -129,15 +129,8 @@ const (
 // specific language or locale. All language tag values are guaranteed to be
 // well-formed.
 type Tag struct {
-	lang   langID
-	region regionID
-	// TODO: we will soon run out of positions for script. Idea: instead of
-	// storing lang, region, and script codes, store only the compact index and
-	// have a lookup table from this code to its expansion. This greatly speeds
-	// up table lookup, speed up common variant cases.
-	// This will also immediately free up 3 extra bytes. Also, the pVariant
-	// field can now be moved to the lookup table, as the compact index uniquely
-	// determines the offset of a possible variant.
+	lang     langID
+	region   regionID
 	script   scriptID
 	pVariant byte   // offset in str, includes preceding '-'
 	pExt     uint16 // offset of first extension, includes preceding '-'
@@ -600,7 +593,7 @@ func (t Tag) Extension(x byte) (ext Extension, ok bool) {
 			return Extension{ext}, true
 		}
 	}
-	return Extension{}, false
+	return Extension{string(x)}, false
 }
 
 // Extensions returns all extensions of t.