Refactor locale number (#24134)

Before, the `GiteaLocaleNumber.js` was just written as a a drop-in
replacement for old `js-pretty-number`.

Actually, we can use Golang's `text` package to format.

This PR partially completes the TODOs in `GiteaLocaleNumber.js`:

> if we have complete backend locale support (eg: Golang "x/text"
package), we can drop this component.
> tooltip: only 2 usages of this, we can replace it with Golang's
"x/text/number" package in the future.

This PR also helps #24131

Screenshots:

<details>

![image](https://user-images.githubusercontent.com/2114189/232179420-b1b9974b-9d96-4408-b209-b80182c8b359.png)


![image](https://user-images.githubusercontent.com/2114189/232179416-14f36aa0-3f3e-4ac9-b366-7bd3a4464a11.png)

</details>

1 files changed, 3 insertions, 11 deletions

diff --git a/modules/charset/escape_test.go b/modules/charset/escape_test.go
index 26e82bf13a..f63c5c5c52 100644
--- a/modules/charset/escape_test.go
+++ b/modules/charset/escape_test.go
@@ -132,18 +132,10 @@ then resh (ר), and finally heh (ה) (which should appear leftmost).`,
 	},
 }
 
-type nullLocale struct{}
-
-func (nullLocale) Language() string                                                   { return "" }
-func (nullLocale) Tr(key string, _ ...interface{}) string                             { return key }
-func (nullLocale) TrN(cnt interface{}, key1, keyN string, args ...interface{}) string { return "" }
-
-var _ (translation.Locale) = nullLocale{}
-
 func TestEscapeControlString(t *testing.T) {
 	for _, tt := range escapeControlTests {
 		t.Run(tt.name, func(t *testing.T) {
-			status, result := EscapeControlString(tt.text, nullLocale{})
+			status, result := EscapeControlString(tt.text, &translation.MockLocale{})
 			if !reflect.DeepEqual(*status, tt.status) {
 				t.Errorf("EscapeControlString() status = %v, wanted= %v", status, tt.status)
 			}
@@ -179,7 +171,7 @@ func TestEscapeControlReader(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			input := strings.NewReader(tt.text)
 			output := &strings.Builder{}
-			status, err := EscapeControlReader(input, output, nullLocale{})
+			status, err := EscapeControlReader(input, output, &translation.MockLocale{})
 			result := output.String()
 			if err != nil {
 				t.Errorf("EscapeControlReader(): err = %v", err)
@@ -201,5 +193,5 @@ func TestEscapeControlReader_panic(t *testing.T) {
 	for i := 0; i < 6826; i++ {
 		bs = append(bs, []byte("—")...)
 	}
-	_, _ = EscapeControlString(string(bs), nullLocale{})
+	_, _ = EscapeControlString(string(bs), &translation.MockLocale{})
 }