Translate code, comments and logs to English; English README; configurable paths and env varsHEADmain

Identifiers, docstrings, comments and console messages are now in English.
Narration, subtitles and on-screen text stay in Spanish (they are the video
content). The Blender <-> Godot physics protocol uses English keys and body
prefixes chosen to keep the original creation order, so cached simulations and
renders stay bit-identical. The old Spanish environment variable names are still
accepted.

1 files changed, 34 insertions, 34 deletions

diff --git a/scenes/v9_regla72.py b/scenes/v9_regla72.py
index 9811ff4..75d3f3b 100644
--- a/scenes/v9_regla72.py
+++ b/scenes/v9_regla72.py
@@ -4,34 +4,34 @@ sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
 from manim import *
 from tiktok import *
 
-BAR_X0, BAR_MAX = -2.35, 3.3     # barra proporcional a los años
+BAR_X0, BAR_MAX = -2.35, 3.3     # bar proportional to the years
 
 
-class Regla72(TikTok):
+class RuleOf72(TikTok):
     NAME = "regla72"
 
-    def fila(self, tasa, anios, y, color, maxa=12.0):
-        t = Text(f"{tasa}%", font=FONT, font_size=46, weight=BOLD, color=color)
+    def row(self, rate, years, y, color, maxa=12.0):
+        t = Text(f"{rate}%", font=FONT, font_size=46, weight=BOLD, color=color)
         t.move_to([-3.95, y, 0], LEFT)
-        w = max(anios / maxa * BAR_MAX, 0.05)
+        w = max(years / maxa * BAR_MAX, 0.05)
         bar = RoundedRectangle(corner_radius=0.1, width=w, height=0.46, stroke_width=0,
                                fill_color=color, fill_opacity=1)
         bar.move_to([BAR_X0, y, 0], LEFT)
-        lab = Text(f"{anios:g} años".replace(".", ","), font=FONT, font_size=40,
+        lab = Text(f"{years:g} años".replace(".", ","), font=FONT, font_size=40,
                    weight=BOLD, color=WHITE)
         lab.next_to(bar, RIGHT, buff=0.25)
         return VGroup(t, bar, lab)
 
     def construct(self):
         self.prepare()
-        chip = self.chip("Finanzas en 40 segundos", VERDE)
+        chip = self.chip("Finanzas en 40 segundos", C_GREEN)
 
         with self.beat(0) as b:
             q = VGroup(
                 self.fit(Text("¿cuánto tarda tu plata", font=FONT, font_size=52,
                               weight=BOLD, color=WHITE), 8.2),
                 self.fit(Text("en duplicarse?", font=FONT, font_size=52,
-                              weight=BOLD, color=AMBAR), 8.2),
+                              weight=BOLD, color=AMBER), 8.2),
             ).arrange(DOWN, buff=0.3).move_to(UP * 3.4)
             b.play(FadeIn(chip, shift=DOWN * 0.3), run_time=0.45)
             b.play(FadeIn(q[0], shift=UP * 0.15), run_time=0.6)
@@ -39,74 +39,74 @@ class Regla72(TikTok):
 
         with self.beat(1) as b:
             name = self.fit(Text("LA REGLA DEL 72", font=FONT, font_size=66,
-                                 weight=BOLD, color=VERDE), 8.2).move_to(UP * 1.4)
+                                 weight=BOLD, color=C_GREEN), 8.2).move_to(UP * 1.4)
             b.play(FadeIn(name, scale=0.7), run_time=0.8)
-            b.play(Flash(name, color=VERDE, line_length=0.6, num_lines=20,
+            b.play(Flash(name, color=C_GREEN, line_length=0.6, num_lines=20,
                          flash_radius=2.6), run_time=0.7)
 
         with self.beat(2) as b:
             f = MathTex(r"\frac{72}{\text{tasa anual}} = \text{años}",
                         color=WHITE).scale(1.5).move_to(DOWN * 0.6)
-            f[0][0:2].set_color(VERDE)
+            f[0][0:2].set_color(C_GREEN)
             b.play(FadeOut(q), name.animate.scale(0.62).move_to(UP * 5.35), run_time=0.6)
             b.play(Write(f), run_time=1.1)
 
         rows = []
-        for i, (tasa, anios, col, yy) in enumerate(
-                [(6, 12, AMBAR, -2.6), (9, 8, CELESTE, -3.7), (12, 6, VERDE, -4.8)]):
-            rows.append(self.fila(tasa, anios, yy, col))
+        for i, (rate, years, col, yy) in enumerate(
+                [(6, 12, AMBER, -2.6), (9, 8, C_SKY, -3.7), (12, 6, C_GREEN, -4.8)]):
+            rows.append(self.row(rate, years, yy, col))
 
         with self.beat(3) as b:
             b.play(f.animate.scale(0.72).move_to(UP * 3.6), run_time=0.5)
             for r in rows:
                 r.shift(UP * 4.3)
-            cuenta = MathTex(r"72 \div 6 = 12", color=AMBAR).scale(1.35).move_to(UP * 1.75)
-            b.play(Write(cuenta), run_time=0.8)
+            count = MathTex(r"72 \div 6 = 12", color=AMBER).scale(1.35).move_to(UP * 1.75)
+            b.play(Write(count), run_time=0.8)
             b.play(FadeIn(rows[0][0]), GrowFromEdge(rows[0][1], LEFT),
                    FadeIn(rows[0][2]), run_time=0.8)
 
         with self.beat(4) as b:
-            c2 = MathTex(r"72 \div 9 = 8", color=CELESTE).scale(1.35).move_to(UP * 1.75)
-            b.play(Transform(cuenta, c2), run_time=0.6)
+            c2 = MathTex(r"72 \div 9 = 8", color=C_SKY).scale(1.35).move_to(UP * 1.75)
+            b.play(Transform(count, c2), run_time=0.6)
             b.play(FadeIn(rows[1][0]), GrowFromEdge(rows[1][1], LEFT),
                    FadeIn(rows[1][2]), run_time=0.8)
 
         with self.beat(5) as b:
-            c3 = MathTex(r"72 \div 12 = 6", color=VERDE).scale(1.35).move_to(UP * 1.75)
-            b.play(Transform(cuenta, c3), run_time=0.6)
+            c3 = MathTex(r"72 \div 12 = 6", color=C_GREEN).scale(1.35).move_to(UP * 1.75)
+            b.play(Transform(count, c3), run_time=0.6)
             b.play(FadeIn(rows[2][0]), GrowFromEdge(rows[2][1], LEFT),
                    FadeIn(rows[2][2]), run_time=0.8)
 
         tabla = VGroup(*rows)
         with self.beat(6) as b:
-            inv = self.fit(Text("y también al revés", font=FONT, font_size=50,
-                                weight=BOLD, color=ROSA), 8.0).move_to(DOWN * 1.1)
-            b.play(FadeOut(cuenta), run_time=0.3)
-            b.play(FadeIn(inv, shift=UP * 0.15), run_time=0.7)
+            inv_m = self.fit(Text("y también al revés", font=FONT, font_size=50,
+                                weight=BOLD, color=C_PINK), 8.0).move_to(DOWN * 1.1)
+            b.play(FadeOut(count), run_time=0.3)
+            b.play(FadeIn(inv_m, shift=UP * 0.15), run_time=0.7)
 
         with self.beat(7) as b:
-            b.play(FadeOut(VGroup(tabla, inv)), run_time=0.45)
+            b.play(FadeOut(VGroup(tabla, inv_m)), run_time=0.45)
             infl = VGroup(
                 self.fit(Text("30% de inflación anual", font=FONT, font_size=48,
-                              weight=BOLD, color=ROSA), 8.2),
+                              weight=BOLD, color=C_PINK), 8.2),
                 self.fit(Text("tu plata vale la mitad", font=FONT, font_size=44,
                               weight=BOLD, color=WHITE), 8.2),
                 self.fit(Text("en 2,4 años", font=FONT, font_size=56,
-                              weight=BOLD, color=ROSA), 8.2),
+                              weight=BOLD, color=C_PINK), 8.2),
             ).arrange(DOWN, buff=0.35).move_to(UP * 0.35)
             b.play(FadeIn(infl[0], shift=UP * 0.15), run_time=0.6)
             b.play(FadeIn(infl[1], shift=UP * 0.15), run_time=0.6)
             b.play(FadeIn(infl[2], scale=0.7), run_time=0.7)
 
         with self.beat(8) as b:
-            c4 = MathTex(r"72 \div 30 = 2{,}4", color=ROSA).scale(1.45).move_to(DOWN * 2.5)
+            c4 = MathTex(r"72 \div 30 = 2{,}4", color=C_PINK).scale(1.45).move_to(DOWN * 2.5)
             b.play(Write(c4), run_time=1.0)
 
         with self.beat(9) as b:
             b.play(FadeOut(VGroup(infl, c4)), run_time=0.4)
             cmp = VGroup(
-                Text("exacto:  11,9 años", font=FONT, font_size=42, color=GRIS),
-                Text("regla:   12 años", font=FONT, font_size=42, weight=BOLD, color=VERDE),
+                Text("exacto:  11,9 años", font=FONT, font_size=42, color=C_GRAY),
+                Text("regla:   12 años", font=FONT, font_size=42, weight=BOLD, color=C_GREEN),
             ).arrange(DOWN, buff=0.3, aligned_edge=LEFT).move_to(UP * 0.4)
             ok = self.fit(Text("es aproximada, pero se clava", font=FONT, font_size=42,
                                weight=BOLD, color=WHITE), 8.2).next_to(cmp, DOWN, buff=0.6)
@@ -116,9 +116,9 @@ class Regla72(TikTok):
 
         with self.beat(10) as b:
             b.play(FadeOut(VGroup(cmp, ok)), run_time=0.35)
-            cta = self.fit(Text("guardate esta cuenta", font=FONT, font_size=60,
-                                weight=BOLD, color=AMBAR), 8.0).move_to(UP * 0.4)
-            b.play(Write(cta), run_time=0.9)
-            b.play(Circumscribe(cta, color=AMBAR, buff=0.3, stroke_width=7), run_time=1.0)
+            count_txt = self.fit(Text("guardate esta cuenta", font=FONT, font_size=60,
+                                weight=BOLD, color=AMBER), 8.0).move_to(UP * 0.4)
+            b.play(Write(count_txt), run_time=0.9)
+            b.play(Circumscribe(count_txt, color=AMBER, buff=0.3, stroke_width=7), run_time=1.0)
 
         self.finish()