Make better use of i18n (#20096)

* Prototyping

* Start work on creating offsets

* Modify tests

* Start prototyping with actual MPH

* Twiddle around

* Twiddle around comments

* Convert templates

* Fix external languages

* Fix latest translation

* Fix some test

* Tidy up code

* Use simple map

* go mod tidy

* Move back to data structure

- Uses less memory by creating for each language a map.

* Apply suggestions from code review

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

* Add some comments

* Fix tests

* Try to fix tests

* Use en-US as defacto fallback

* Use correct slices

* refactor (#4)

* Remove TryTr, add log for missing translation key

* Refactor i18n

- Separate dev and production locale stores.
- Allow for live-reloading in dev mode.

Co-authored-by: zeripath <art27@cantab.net>

* Fix live-reloading & check for errors

* Make linter happy

* live-reload with periodic check (#5)

* Fix tests

Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: zeripath <art27@cantab.net>

modules/templates/helper.go

@@ -105,7 +105,6 @@ func NewFuncMap() []template.FuncMap {
 		"Str2html":       Str2html,
 		"TimeSince":      timeutil.TimeSince,
 		"TimeSinceUnix":  timeutil.TimeSinceUnix,
-		"RawTimeSince":   timeutil.RawTimeSince,
 		"FileSize":       base.FileSize,
 		"PrettyNumber":   base.PrettyNumber,
 		"JsPrettyNumber": JsPrettyNumber,
@@ -484,7 +483,6 @@ func NewTextFuncMap() []texttmpl.FuncMap {
 		},
 		"TimeSince":     timeutil.TimeSince,
 		"TimeSinceUnix": timeutil.TimeSinceUnix,
-		"RawTimeSince":  timeutil.RawTimeSince,
 		"DateFmtLong": func(t time.Time) string {
 			return t.Format(time.RFC1123Z)
 		},