🖊️ Add support for boolean values (#5524)

Fixes #5370
Adds support for boolean values with the following caveats:
- we support both `true` and `True` as correct boolean values. Since hedy is currently case sensitive, this PR uses a workaround to support both values and does not attempt to solve the case sensitivity issue.
- when printed, the boolean value will appear as a correct python value, e.g. `True`, regardless in which language it was originally written. In other words, the Bulgarian program `{print} {true}` will yield literally `True`. The problem cannot be solved with the existing mechanisms in Hedy, so a separate issue will be created to address the matter.
- highlighting is still work in progress

**How to test**
In levels 15-18, try the following programs:
```
a is true
print a
```
```
a is true

while a = True
    print 1
    a = false

print 2
```

content/keywords/ar.yaml

@@ -25,6 +25,8 @@ define: define
 echo: ردد
 elif: وإلا اذا
 else: وإلا
+'false': 'false'
+'False': 'False'
 for: لكل
 forward: تقدم
 from: من
@@ -57,6 +59,8 @@ step: خطوة
 times: مرة
 to: الى
 to_list: الى
+'true': 'true'
+'True': 'True'
 turn: استدر
 while: بينما
 white: ابيض

content/keywords/bg.yaml

@@ -25,6 +25,8 @@ define: дефинирай
 echo: покажи
 elif: иначе ако
 else: иначе
+'false': невярно
+'False': Невярно
 for: за
 forward: напред
 from: от
@@ -57,6 +59,8 @@ step: стъпка
 times: пъти
 to: до
 to_list: до
+'true': вярно
+'True': Вярно
 turn: завий
 while: докато
 white: бяло

content/keywords/bn.yaml

@@ -25,6 +25,8 @@ define: define
 echo: echo
 elif: elif
 else: else
+'false': 'false'
+'False': 'False'
 for: for
 forward: forward
 from: from
@@ -57,6 +59,8 @@ step: step
 times: times
 to: to
 to_list: to
+'true': 'true'
+'True': 'True'
 turn: turn
 while: while
 white: white

content/keywords/ca.yaml

@@ -25,6 +25,8 @@ define: defineix
 echo: eco
 elif: sinosi
 else: sino
+'false': 'false'
+'False': 'False'
 for: per
 forward: avança
 from: de
@@ -57,6 +59,8 @@ step: pas
 times: vegades
 to: fins
 to_list: a
+'true': 'true'
+'True': 'True'
 turn: gira
 while: mentre
 white: blanc

content/keywords/cs.yaml

@@ -25,6 +25,8 @@ define: define
 echo: echo
 elif: elif
 else: else
+'false': 'false'
+'False': 'False'
 for: for
 forward: forward
 from: from
@@ -57,6 +59,8 @@ step: step
 times: times
 to: to
 to_list: to
+'true': 'true'
+'True': 'True'
 turn: turn
 while: while
 white: white

content/keywords/cy.yaml

@@ -25,6 +25,8 @@ define: define
 echo: adleisio
 elif: elif
 else: arall
+'false': 'false'
+'False': 'False'
 for: ar gyfer
 forward: ymlaen
 from: o
@@ -57,6 +59,8 @@ step: cam
 times: gwaith
 to: i
 to_list: i
+'true': 'true'
+'True': 'True'
 turn: troi
 while: tra
 white: gwyn

content/keywords/da.yaml

@@ -25,6 +25,8 @@ define: define
 echo: ekko
 elif: elif
 else: else
+'false': 'false'
+'False': 'False'
 for: for
 forward: fremad
 from: from
@@ -57,6 +59,8 @@ step: step
 times: times
 to: to
 to_list: to
+'true': 'true'
+'True': 'True'
 turn: drej
 while: while
 white: white

content/keywords/de.yaml

@@ -25,6 +25,8 @@ define: define
 echo: echo
 elif: sofalls
 else: sonst
+'false': 'false'
+'False': 'False'
 for: für
 forward: vorwärts
 from: aus
@@ -57,6 +59,8 @@ step: schritt
 times: mal
 to: bis
 to_list: zu
+'true': 'true'
+'True': 'True'
 turn: drehe
 while: solange
 white: Weiß

content/keywords/el.yaml

@@ -25,6 +25,8 @@ define: define
 echo: echo
 elif: elif
 else: else
+'false': 'false'
+'False': 'False'
 for: for
 forward: forward
 from: from
@@ -57,6 +59,8 @@ step: step
 times: times
 to: to
 to_list: to
+'true': 'true'
+'True': 'True'
 turn: turn
 while: while
 white: white

content/keywords/en.yaml

@@ -25,6 +25,8 @@ define: define
 echo: echo
 elif: elif
 else: else
+'false': 'false'
+'False': 'False'
 for: for
 forward: forward
 from: from
@@ -57,6 +59,8 @@ step: step
 times: times
 to: to
 to_list: to
+'true': 'true'
+'True': 'True'
 turn: turn
 while: while
 white: white

content/keywords/eo.yaml

@@ -25,6 +25,8 @@ define: define
 echo: eĥu|ehhu|ehxu|e^hu|eh^u
 elif: alie se
 else: alie
+'false': 'false'
+'False': 'False'
 for: por
 forward: antaŭen|antauen|antauxen
 from: el
@@ -57,6 +59,8 @@ step: paŝo|pasho|pasxo|pa^so|pas^o
 times: fojojn
 to: ĝis|ghis|gxis|^gis|g^is
 to_list: al
+'true': 'true'
+'True': 'True'
 turn: turnu
 while: dum
 white: blanka

content/keywords/es.yaml

@@ -25,6 +25,8 @@ define: definir
 echo: eco
 elif: sinosi
 else: sino
+'false': 'false'
+'False': 'False'
 for: para
 forward: adelante
 from: de
@@ -57,6 +59,8 @@ step: paso
 times: veces
 to: a
 to_list: a
+'true': 'true'
+'True': 'True'
 turn: girar
 while: mientras
 white: blanco

content/keywords/et.yaml

@@ -25,6 +25,8 @@ define: define
 echo: peegelda
 elif: muidukui
 else: muidu
+'false': 'false'
+'False': 'False'
 for: jaoks
 forward: edasi
 from: nimistust
@@ -57,6 +59,8 @@ step: sammuga
 times: korda
 to: kuni
 to_list: nimistusse
+'true': 'true'
+'True': 'True'
 turn: pööra
 while: senikui
 white: valge

content/keywords/fa.yaml

@@ -25,6 +25,8 @@ define: define
 echo: echo
 elif: elif
 else: else
+'false': 'false'
+'False': 'False'
 for: for
 forward: به جلو
 from: from
@@ -57,6 +59,8 @@ step: step
 times: times
 to: to
 to_list: to
+'true': 'true'
+'True': 'True'
 turn: دور بزن
 while: while
 white: سفید

content/keywords/fi.yaml

@@ -25,6 +25,8 @@ define: define
 echo: kaiku
 elif: muutenjos
 else: muuten
+'false': 'false'
+'False': 'False'
 for: jokaiselle
 forward: eteenpäin
 from: listasta
@@ -57,6 +59,8 @@ step: askel
 times: kertaa
 to: asti
 to_list: listaksi
+'true': 'true'
+'True': 'True'
 turn: käänny
 while: kun
 white: valkoinen

content/keywords/fr.yaml

@@ -25,6 +25,8 @@ define: définis
 echo: réponds
 elif: sinon si
 else: sinon
+'false': 'false'
+'False': 'False'
 for: pour
 forward: avance
 from: de
@@ -57,6 +59,8 @@ step: pas
 times: fois
 to: à
 to_list: à
+'true': 'true'
+'True': 'True'
 turn: tourne
 while: tant que
 white: blanc

content/keywords/fr_CA.yaml

@@ -25,6 +25,8 @@ define: définis
 echo: réponds
 elif: sinon si
 else: sinon
+'false': 'false'
+'False': 'False'
 for: pour
 forward: avance
 from: de
@@ -57,6 +59,8 @@ step: pas
 times: fois
 to: à
 to_list: à
+'true': 'true'
+'True': 'True'
 turn: tourne
 while: tant que
 white: blanc

content/keywords/fy.yaml

@@ -25,6 +25,8 @@ define: define
 echo: echo
 elif: elif
 else: else
+'false': 'false'
+'False': 'False'
 for: for
 forward: forward
 from: from
@@ -57,6 +59,8 @@ step: step
 times: times
 to: to
 to_list: to
+'true': 'true'
+'True': 'True'
 turn: turn
 while: while
 white: white

content/keywords/he.yaml

@@ -25,6 +25,8 @@ define: define
 echo: הדהד
 elif: אחרתאם
 else: אחרת
+'false': 'false'
+'False': 'False'
 for: לכל
 forward: קדימה
 from: מ
@@ -57,6 +59,8 @@ step: צעד
 times: פעמים
 to: עד
 to_list: אל
+'true': 'true'
+'True': 'True'
 turn: פנה
 while: כלעוד
 white: לבן

content/keywords/hi.yaml

@@ -25,6 +25,8 @@ define: define
 echo: गूंज
 elif: एलिफ
 else: अन्यथा
+'false': 'false'
+'False': 'False'
 for: के लिये
 forward: आगे
 from: से
@@ -57,6 +59,8 @@ step: क़दम
 times: बार
 to: से
 to_list: से
+'true': 'true'
+'True': 'True'
 turn: मोड़
 while: व्हाइल
 white: सफ़ेद

content/keywords/hu.yaml

@@ -25,6 +25,8 @@ define: define
 echo: utánoz
 elif: egybk-ha
 else: egyébként
+'false': 'false'
+'False': 'False'
 for: minden
 forward: előre
 from: ebből
@@ -57,6 +59,8 @@ step: lépésenként
 times: alkalommal
 to: től
 to_list: ebbe
+'true': 'true'
+'True': 'True'
 turn: fordul
 while: amíg
 white: fehér

content/keywords/ia.yaml

@@ -25,6 +25,8 @@ define: define
 echo: echo
 elif: elif
 else: else
+'false': 'false'
+'False': 'False'
 for: for
 forward: forward
 from: from
@@ -57,6 +59,8 @@ step: step
 times: times
 to: to
 to_list: to
+'true': 'true'
+'True': 'True'
 turn: turn
 while: while
 white: white