Restructure go project (#2356)

* Move main to cmd
* Move api to internal
* Move logger and manager to internal
* Move shell hiding code to separate package
* Decouple job from desktop and utils
* Decouple session from config
* Move static into internal
* Decouple config from dlna
* Move desktop to internal
* Move dlna to internal
* Decouple remaining packages from config
* Move config into internal
* Move jsonschema and paths to models
* Make ffmpeg functions private
* Move file utility methods into fsutil package
* Move symwalk into fsutil
* Move single-use util functions into client package
* Move slice functions to separate packages
* Add env var to suppress windowsgui arg
* Move hash functions into separate package
* Move identify to internal
* Move autotag to internal
* Touch UI when generating backend

internal/api/locale.go

@@ -0,0 +1,39 @@
+package api
+
+import (
+	"golang.org/x/text/collate"
+	"golang.org/x/text/language"
+)
+
+// matcher defines a matcher for the languages we support
+var matcher = language.NewMatcher([]language.Tag{
+	language.MustParse("en-US"), // The first language is used as fallback.
+	language.MustParse("en-GB"),
+	language.MustParse("en-AU"),
+	language.MustParse("es-ES"),
+	language.MustParse("de-DE"),
+	language.MustParse("it-IT"),
+	language.MustParse("fr-FR"),
+	language.MustParse("fi-FI"),
+	language.MustParse("pt-BR"),
+	language.MustParse("sv-SE"),
+	language.MustParse("zh-CN"),
+	language.MustParse("zh-TW"),
+	language.MustParse("hr-HR"),
+	language.MustParse("nl-NL"),
+	language.MustParse("ru-RU"),
+	language.MustParse("tr-TR"),
+})
+
+// newCollator parses a locale into a collator
+// Go through the available matches and return a valid match, in practice the first is a fallback
+// Optionally pass collation options through for creation.
+// If passed a nil-locale string, return nil
+func newCollator(locale *string, opts ...collate.Option) *collate.Collator {
+	if locale == nil {
+		return nil
+	}
+
+	tag, _ := language.MatchStrings(matcher, *locale)
+	return collate.New(tag, opts...)
+}