mod_collabora: add simple multi lang support

[grabs]

Hi,
I added a simple multi lang support for this plugin.
Since the loleaflet.html accepts a lang parameter. So we can use the current language to set the interface language of the collabora instance.
Collabora does not accept all lang strings. So I use a constant with accepted strings. Maybe later we can change this into a setting.
Collabora need strings like en or en-us (note the hyphen). Strings with a wrong second part are also possible which leads to a fallback of the first part. The string de_comm which does not exist in collabora would result in de.
A not accepted first part, e.g. yy_abc will result in an empty page. To prevent this I check the first part of the current language and compare it with the accepted strings list.
Best regards
Andreas

[codecov-commenter]

Codecov Report

Merging #24 into master will decrease coverage by 0.48%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #24      +/-   ##
============================================
- Coverage     14.02%   13.53%   -0.49%     
- Complexity      137      142       +5     
============================================
  Files            17       17              
  Lines           699      724      +25     
============================================
  Hits             98       98              
- Misses          601      626      +25     

Impacted Files	Coverage Δ	Complexity Δ
moodle/mod/collabora/classes/collabora.php	33.17% <0.00%> (-4.33%)	64.00% <0.00%> (+5.00%)	⬇️

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[mwuttke]

Hello Ashod,

you have made a lot of code changes. Thanks a lot of your work!

Do you have tested all these settings with moodle group and/or grouping mode too?

@grabs please could you review this patch?

Michael

[mwuttke]

Hello Andreas,

I've tested your PR and it works as expected. Thanks for your work!

@Ashod: please could you review this patch?

Michael

[Ashod]

Looks good, one minor improvement suggested.

[Ashod]

'en' -> self::FALLBACK_LANG

Seems cleaner to avoid hard-coded value when we have a named const.

[Ashod]

Hello Ashod,

you have made a lot of code changes. Thanks a lot of your work!

Do you have tested all these settings with moodle moodle group and/or gouping mode too?

Hi @moodlebeuth ,

I suspect the above comment was meant for one of my PRs, Michael?
If so, which one? And what is grouping mode?

Thanks!

[mwuttke]

Hi @Ashod: I am sos orry, my fault. I meant #21.