feat: allow to translate dataset text on chart

[Ian2012]

Description

This PR allows the translation of text on datasets such as fixed strings by:

• Implementing a jinja filter that converts fixed text (e.g 'audit') to its translation. It uses a CASE clause in the following format:

CASE
   {{column_name}} = {{fixed_string}} THEN {{translation}}
   ...
   ELSE {{column_name}}
END

The jinja filter can be used like this in the Chart dimensions: {% raw %}{{translate_column('enrollment_mode')}}{% endraw %}. You can do it visually and export it (asset serialization will try to keep the proper format):

This is an example of an Spanish translation working.

This PR also updates some metrics names to match what they mean.

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[bmtcril]

Looks good overall, just some questions and thoughts on performance

[bmtcril]

When get_translation is called, localization.py will load all of the translations for all languages into memory. I'm not sure how long that will stick around for, but loading a bunch of files off disk repeatedly might cause performance issues. I doubt we'll have so many strings that it will make much of a dent in server memory, but we might want to compare before and after this change to see.

[Ian2012]

With this change, it's using: 347.1MiB. Before it was: 307Mi. We could load the file only when needed but the disk operation is slower. The file content will be permanently in memory when the first request ask for translations

[SoryRawyer]

Is the --debug flag meant to stay in?

[Ian2012]

Yes, this only will affect dev environment, local en k8s works the same as before.

[SoryRawyer]

I'm assuming the changes to the chart and dataset configurations are due to re-exporting charts that now have translated column names. Is that right?

[Ian2012]

@SoryRawyer Yes, also some metrics were moved from the charts to the dataset and assigned a proper name to be translated.

[bmtcril]

So excited to see this problem solved!

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