Remove flags in language plugins

[Leilei332]

As is discussed in this comment

A related point is that my understanding is that it is not recommended to use flags to represent languages (see this article for an example of the arguments against the practice). I wonder if we should change to using the ISO language codes in the switch (eg "en-GB")

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[Jermolene]

Thanks @Leilei332 this is definitely worth doing. I've been aware of the issues with using flags for a long time and it is about time we fixed it.

I pushed some updates to get things building and start to figure out the dependencies that need adjustment. I've also added a generic "language" icon for use in the page control button.

I think some more testing is needed but this feels quite close to being mergeable.

[Jermolene]

Thanks @Leilei332 do you think this is ready to merge?

[Leilei332]

I think it is ready to merge this PR now (after the temporary setting is removed).

[pmario]

I am not happy, that the flags are removed and gone. From my point of view they should be moved into a core plugin, with the possibility to load them and recreate the current behaviour.

I am OK that tiddlywiki-com tries to be free of political sentiment according to flags. I am not OK, that it is handled that way, by forcing everyone to remove flags from their wikis.

[Leilei332]

Although flags do add colors to language plugins, I think we had better be practical. The language plugins are used to translate tiddlywiki, not to display a flag. IMO removing flags does more good than harm (Since we already have some controversal ones).

From my point of view they should be moved into a core plugin, with the possibility to load them and recreate the current behaviour.

I don't think it is necessary. For those who want to display a flag in their wiki, they can import the SVG image from wikipedia.