Translate exercism/gdscript#158: Rewrite/simplify the install and testing docs

[exercism-i18n]

English changed in exercism/gdscript#158, by @IsaacG, and a maintainer marked it ready-to-translate.

Repo	exercism/gdscript
Translate at	aa4eff7593c9435ca0e9a0c59e1cbdf2a389c644
Base	44a8d67963598bcad92e99894f707d159f57e219
English files changed	2

Read English at aa4eff7593c9435ca0e9a0c59e1cbdf2a389c644, not at main. A push to the PR that changes English takes the label off and closes this issue as not planned; putting the label back opens a new one.

Type	English file	Translation goes to locales/<locale>/content/
track-docs	docs/INSTALLATION.md	a9/2c/ec1dd35597abd59eeb4a43e313bc4a0c3fbe.md
track-docs	docs/TESTS.md	9e/68/c6bc998299fd489c694fb879f535acab6d3f.md

---

Close this when the translations are on main here for every locale in locales.json productionTargets. Closing it re-runs the i18n completeness check on the PR, which is what is holding its merge.

Add and update only, never delete: main over there still defines the old text until the PR merges, and every other open PR is checked against what is here.

[exercism-i18n]

Starting translation now.

[exercism-i18n]

Translated and pushed to main.

Locale	Translated	Copied	Failed
ar	2	0	0
bn	2	0	0
de	2	0	0
el	2	0	0
es-419	2	0	0
es-ES	2	0	0
fa	2	0	0
fr	2	0	0
hi	2	0	0
hu	2	0	0
it	2	0	0
ja	2	0	0
ko	2	0	0
pt-BR	2	0	0
pt-PT	2	0	0
uk	2	0	0
zh-CN	2	0	0
zh-TW	2	0	0

No failures. Cost: $0.0732.

235e745fce30a09443dc95fc5268881e09463531 on main, translating exercism/gdscript#158 at aa4eff7593c9435ca0e9a0c59e1cbdf2a389c644.