Add Flashduty notification

[guguji5]

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Description

Add notification provider of Flashduty (which is a Saas monitor noise reduction platform in China.)

Type of change

Please delete any options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist

• My code follows the style guidelines of this project
• I ran ESLint and other linters for modified files
• I have performed a self-review of my own code and tested it
• I have commented my code, particularly in hard-to-understand areas
  (including JSDoc for methods)
• My changes generate no new warnings
• My code needed automated testing. I have added them (this is optional task)

Screenshots

[CommanderStorm]

Could you also add a screenshot of the notification provider working? ^^
(This is standard procedure for regional notification providers, as testing them is sadly basically impossible due to region locks and language bariers)

[chakflying]

Missing space.

[guguji5]

Could you also add a screenshot of the notification provider working? ^^ (This is standard procedure for regional notification providers, as testing them is sadly basically impossible due to region locks and language bariers)

Because of the network, may I use the screenshot hosted by imgur? (Currently, most of Flashduty users are in China, so the screenshot has some Chinese words.)

[CommanderStorm]

about the screenshots: Could you attach a screenshot showing how the Test button looks when pressed?
(I am a bit concearned that specifing it as a url => using it as a resource in postNotification might not work)

[guguji5]

about the screenshots: Could you attach a screenshot showing how the Test button looks when pressed? (I am a bit concearned that specifing it as a url => using it as a resource in postNotification might not work)

Yep, you are right. there is a bug when fire a 'Test' request. I fix it by adding '?' before the monitorInfo (which means when the monitorInfo is undefined, abandon the logic behind and return undefined.)

[chakflying]

I think including zh-HK and zh-TW translation is unnecessary. Otherwise looks okay.

[guguji5]

@CommanderStorm is it ready to merge this PR ? or anything to improve ?

[CommanderStorm]

As indicated by my aproval-review:
from my point, no, but only louis vote counts. See our contribution guide: https://github.com/louislam/uptime-kuma/blob/master/CONTRIBUTING.md
The point of reviews from me and Nelson is to reduce unnessesary go-arounds from Louis, not to give any indicaor of timeline/mergability/...

[guguji5]

As indicated by my aproval-review: from my point, no, but only louis vote counts. See our contribution guide: https://github.com/louislam/uptime-kuma/blob/master/CONTRIBUTING.md The point of reviews from me and Nelson is to reduce unnessesary go-arounds from Louis, not to give any indicaor of timeline/mergability/...

thank you for your reply. I will wait louis's feedback.

[louislam]

I think including zh-HK and zh-TW translation is unnecessary. Otherwise looks okay.

Same thought, just need to change zh-CN.json, as the others are using Traditional Chinese.

Other code changes look good to me.

[guguji5]

I think including zh-HK and zh-TW translation is unnecessary. Otherwise looks okay.

Same thought, just need to change zh-CN.json, as the others are using Traditional Chinese.

Other code changes look good to me.

@chakflying @louislam ok, I revert the changes in zh-HK and zh-TW and fix the conflicts in en.json