A tool to help to backport locales, changes source strings to fix other broken translations (#23633)

It use old en-US locales as reference, fill the old other locales with
new locales.

----

## More broken translations

Many translations are still broken. The reason is: at the last time
restoring the ini to crowdin, many semicolon are treated as comments.

Two kinds of broken strings:

### Some translations can be re-translated

<details>

```
skipping options/locale/locale_si-LK.ini org teams.add_nonexistent_repo
skipping options/locale/locale_tr-TR.ini repo commits.search.tooltip
skipping options/locale/locale_es-ES.ini repo settings.trust_model.committer.desc
skipping options/locale/locale_es-ES.ini admin dashboard.new_version_hint
skipping options/locale/locale_pt-PT.ini org teams.add_nonexistent_repo
skipping options/locale/locale_hu-HU.ini install require_sign_in_view_popup
skipping options/locale/locale_hu-HU.ini repo migrate.invalid_local_path
skipping options/locale/locale_id-ID.ini repo migrate.invalid_local_path
skipping options/locale/locale_id-ID.ini org teams.add_nonexistent_repo
skipping options/locale/locale_de-DE.ini repo settings.protect_protected_file_patterns_desc
```

</details>

So this PR also does some small changes on them, to trigger the
re-translation.

### The `locale_el-GR.ini` contains many broken tranlsations

I guess we should reset them from crowdin side, then translators can
re-translate them.

----

Update: in latest main, the strings have been fixed.

## TODO

Update: the el-GR translators have done great job and fixes these broken
translations.


<details>

Merge this PR ASAP and upload `locale_el-GR.ini` to crowdin to remove
broken strings.


Out-dated, fixed in main.


![image](https://user-images.githubusercontent.com/2114189/226954531-36e14527-278a-41a1-8ddb-2b2b27bfc746.png)

</details>

---------

Co-authored-by: delvh <dev.lh@web.de>

build/backport-locales.go

@@ -0,0 +1,89 @@
+//go:build ignore
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+
+	"gopkg.in/ini.v1"
+)
+
+func main() {
+	if len(os.Args) != 2 {
+		println("usage: backport-locales <to-ref>")
+		println("eg: backport-locales release/v1.19")
+		os.Exit(1)
+	}
+
+	ini.PrettyFormat = false
+	mustNoErr := func(err error) {
+		if err != nil {
+			panic(err)
+		}
+	}
+	collectInis := func(ref string) map[string]*ini.File {
+		inis := map[string]*ini.File{}
+		err := filepath.WalkDir("options/locale", func(path string, d os.DirEntry, err error) error {
+			if err != nil {
+				return err
+			}
+			if d.IsDir() || !strings.HasSuffix(d.Name(), ".ini") {
+				return nil
+			}
+			cfg, err := ini.LoadSources(ini.LoadOptions{
+				IgnoreInlineComment:         true,
+				UnescapeValueCommentSymbols: true,
+			}, path)
+			mustNoErr(err)
+			inis[path] = cfg
+			fmt.Printf("collecting: %s @ %s\n", path, ref)
+			return nil
+		})
+		mustNoErr(err)
+		return inis
+	}
+
+	// collect new locales from current working directory
+	inisNew := collectInis("HEAD")
+
+	// switch to the target ref, and collect the old locales
+	cmd := exec.Command("git", "checkout", os.Args[1])
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	mustNoErr(cmd.Run())
+	inisOld := collectInis(os.Args[1])
+
+	// use old en-US as the base, and copy the new translations to the old locales
+	enUsOld := inisOld["options/locale/locale_en-US.ini"]
+	for path, iniOld := range inisOld {
+		if iniOld == enUsOld {
+			continue
+		}
+		iniNew := inisNew[path]
+		if iniNew == nil {
+			continue
+		}
+		for _, secEnUS := range enUsOld.Sections() {
+			secOld := iniOld.Section(secEnUS.Name())
+			secNew := iniNew.Section(secEnUS.Name())
+			for _, keyEnUs := range secEnUS.Keys() {
+				if secNew.HasKey(keyEnUs.Name()) {
+					oldStr := secOld.Key(keyEnUs.Name()).String()
+					newStr := secNew.Key(keyEnUs.Name()).String()
+					// A bug: many of new translations with ";" are broken in Crowdin (due to last messy restoring)
+					// As the broken strings are gradually fixed, this workaround check could be removed (in a few months?)
+					if strings.Contains(oldStr, ";") && !strings.Contains(newStr, ";") {
+						println("skip potential broken string", path, secEnUS.Name(), keyEnUs.Name())
+						continue
+					}
+					secOld.Key(keyEnUs.Name()).SetValue(newStr)
+				}
+			}
+		}
+		mustNoErr(iniOld.SaveTo(path))
+	}
+}