Add support for setting text language and direction of the generated HTML page and the DIV containing the problems

[taniwallach]

Copy lib/WeBWorK/Utils/LanguageAndDirection.pm from https://github.com/openwebwork/webwork2 which provides support for setting page level and problem level language and text direction based on the course/request language and settings provided by the PG file.

Have RenderApp/Controller/FormatRenderedProblem.pm use that, where we always force the "choice" for the main HTML page language based on the request parameter "language" (instead of a course setting) and attempt to use the language/direction requested by a PG problem, falling back to English and LTR, as the OPL needs that.

Problems which need a language or direction set should use:

• SET_PROBLEM_LANGUAGE() and/or
• SET_PROBLEM_TEXTDIRECTION()

A screenshot of a Hebrew PG problem (formatted from right-to-left, as needed) when the English feedback messages are in use (just the change from this PR):

A screenshot when the Hebrew feedback messages from #66 are also in use:

---

Here is a sample PG problem which can be used to test this:

# Local notes:
# Based on Library/CollegeOfIdaho/setAlgebra_05_04_FactoringTrinomials/54IntAlg_27_FactorTrinomial.pg
# Translated to Hebrew and modified by Nathan Wallach, March 2019
###DESCRIPTION
## Factoring Trinomials
##
##ENDDESCRIPTION
## DBsubject(Algebra)
## DBchapter(Factoring)
## DBsection(Factoring trinomials)
## Institution(Technion)
## Author(RA Cruz, Nathan Wallach)
## Level(3)
## KEYWORDS('factoring')
## Date: 2019/03

DOCUMENT(); # This should be the first executable line in the problem.

loadMacros(
  "PGstandard.pl",
  "MathObjects.pl",
  "CofIdaho_macros.pl",
  "AnswerFormatHelp.pl",
  "PGcourse.pl"
);

SET_PROBLEM_TEXTDIRECTION("rtl");
SET_PROBLEM_LANGUAGE("he-IL");

TEXT(beginproblem());

######################################
#  Setup

$a = list_random(3,5,7);

$polynomial = Formula("x^3 + x^2 - ($a)^2 x - ($a)^2")->reduce->TeX;

######################################
#  Main text

BEGIN_TEXT
פרקו את הפולינום  \( $polynomial \)
כמכפלה של גורמים לינארים מהצורה  \( (x \pm \alpha) \).
$PAR
\{ openSpan( { "dir" => "ltr" } ) \}
\( $polynomial = \) \{ ans_rule(30) \}
\{ closeSpan() \}
$BR
${BBOLD}הנחיות להזנת התשובה${EBOLD}, עקב אילוצי תוכנת הבדיקה:
$BR
$SPACE$SPACE 1. אסור לרשום בתשובה לשאלה זו גורם מהצורה \( (x - (- \alpha) ) \)
   ויש לרשום במקום בצורה \( (x + \alpha ) \).
$BR
$SPACE$SPACE 2. \{ AnswerFormatHelp("formulas","הנחיות להזנת פונקציות") \}
END_TEXT

######################################
#  Answer

$answer="(x-$a) * (x + $a) * (x + 1)";
ANS(FactoringEvaluator($answer,"x"));

$showPartialCorrectAnswers = 1;

######################################
ENDDOCUMENT();

[drdrew42]

🥇