maketext - patch so it works inside PG also

[taniwallach]

Moving drdrew42#86 to here.

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This continues work started in drdrew42#66.

maketext calls inside PG were not using the language requested by the API request, as lib/WeBWorK/lib/WeBWorK/PG.pm sets

	$envir{language}            = $ce->{language};

(the language later used for maketext calls inside PG) and the $seed_ce created by the Standalone renderer was not providing a language setting.

To fix the issue we add a language setting to the $seed_ce which will get passed into PG.

The change is done so that the core PG code pulled in from outside the Standalone repository does not need to be modified.

After this PR the maketext inside PG should hopefully work as well as they do in webwork2 and pg version 2.16. (The limitations of maketext in WWSafe probably still apply, so maketext calls inside PG cannot use a parameter at present.)

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Testing can be done using via localhost when the renderer is running locally via Docker by checking the output of a page like http://localhost:3000/render-api?sourceFilePath=Library/Mizzou/Algebra/inverse_functions_and_relations/find_dom_range_inv_graph_01.pg&problemSeed=1&outputFormat=simple&language=heb before and after the patch.

Before the patch, you should see You can earn partial credit on this problem. in English just above the buttons (which will be in Hebrew) and after the patch (and a restart of the container) you should see ניתן לקבל ניקוד חלקי בשאלה זו. in Hebrew.

Before the patch:

After the patch:

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At present, Hebrew is the only language other than English for which there is a PO translation dictionary for the renderer.

Use of any invalid value for language will cause maketext to fall back to the default (English) phrases.