port scripts into respec post-script by promise

[himorin]

as proposal, closes #260

further items which could be investigated

• [x] (for use with respec) timing between initializeLang and respec processing: initializeLang need to run after respec
  • e.g. checking respec is loaded or not
• whether to divide functions needs to be persistent (inizializeLang and switchLang) and only used with respec (else)?
• [x] switchLang should have tri-state for langs array (not to run updating texts multiple times on 'all')
  • by measuring with performance, switchLang processing takes only around 100msec and possible duplicated part (replacing text in header part by suitable lnaguage's one) takes 1/3. so no much gain by this.

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PR Preview relies on a number of web services to run. There seems to be an issue with the following one: :rotating_light: [Spec Generator](https://www.w3.org/2015/labs/) - Spec Generator is the web service used to build specs that rely on ReSpec. :link: [Related URL]([object Object]) ``` Navigation timeout of 28237 ms exceeded ``` _If you don't have enough information above to solve the error by yourself (or to understand to which web service the error is related to, if any), please [file an issue](https://github.com/tobie/pr-preview/issues/new?title=Error%20not%20surfaced%20properly&body=See%20w3c/jlreq%23264.)._

[kidayasuo]

@r12a and this one, please. Thank you!

[kidayasuo]

From JLReq TF meeting on 2024-2-27: We would like to include this fix to the next and possibly the final revision of JLReq. The fix was developed three years ago, reviewed and approved by one reviewer (@xfq).

@r12a, I would greatly appreciate it if you could add your review. If we do not hear from you in two weeks we would like to go ahead with merging. thanks!

[xfq]

(Note that this branch has conflicts that must be resolved.)

[r12a]

Sorry, i thought i'd already replied on this. It's been a long time since i wrote the code which is being changed here, and (1) it will take me a long time to review properly, (2) i am not familiar with how to use promises in JS.

Could someone indicate why the change is being made, and how it affects current functionality for the user?

Btw, i thought that the Japanese translations for the SOTD were provided by respec - we worked with them on localisation code. Could someone check the situation? (maybe @xfq).

[xfq]

Sorry, i thought i'd already replied on this. It's been a long time since i wrote the code which is being changed here, and (1) it will take me a long time to review properly, (2) i am not familiar with how to use promises in JS.

Could someone indicate why the change is being made, and how it affects current functionality for the user?

The change is being made because the current language switching function doesn't work. See https://github.com/w3c/jlreq/issues/260

Btw, i thought that the Japanese translations for the SOTD were provided by respec - we worked with them on localisation code. Could someone check the situation? (maybe @xfq).

Their translation does not include SOTD, and their localisation code is not suitable for us IIRC. It is only suitable when the full document is in Japanese (static lang=ja, not dynamic switching).