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, 32 insertions, 32 deletions

diff --git a/scenes/v4_luna.py b/scenes/v4_luna.py
index f69f99a..ff17031 100644
--- a/scenes/v4_luna.py
+++ b/scenes/v4_luna.py
@@ -4,8 +4,8 @@ sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
 from manim import *
 from tiktok import *
 
-Y0, Y1 = -3.25, 4.20          # extremos del eje logaritmico
-L0, L1 = -1.0, 11.8           # log10 del espesor en mm
+Y0, Y1 = -3.25, 4.20          # ends of the log axis
+L0, L1 = -1.0, 11.8           # log10 of the thickness in mm
 BAR_X, BAR_W = -3.15, 1.0
 MOON_MM = 3.844e11
 
@@ -15,11 +15,11 @@ def ypos(mm):
     return Y0 + (L - L0) / (L1 - L0) * (Y1 - Y0)
 
 
-def espesor(n):
+def thickness(n):
     return 0.1 * (2 ** n)
 
 
-def humano(mm):
+def human(mm):
     if mm < 10:
         return f"{mm:.1f} mm".replace(".", ",")
     if mm < 1e4:
@@ -29,7 +29,7 @@ def humano(mm):
     return f"{mm/1e6:,.0f} km".replace(",", ".")
 
 
-class Luna(TikTok):
+class Moon(TikTok):
     NAME = "luna"
 
     def moon(self, r=0.62):
@@ -43,7 +43,7 @@ class Luna(TikTok):
 
     def construct(self):
         self.prepare()
-        chip = self.chip("Crecimiento exponencial", CELESTE)
+        chip = self.chip("Crecimiento exponencial", C_SKY)
 
         # ---------- hook ----------
         with self.beat(0) as b:
@@ -51,28 +51,28 @@ class Luna(TikTok):
                               fill_color="#1A2440", fill_opacity=1).move_to(LEFT * 2.3 + UP * 2.6)
             fold = Line(sheet.get_corner(UL) + RIGHT * 0.55, sheet.get_corner(DL) + RIGHT * 0.55,
                         stroke_width=3, color="#5E6B87")
-            mo = self.moon(0.95).move_to(RIGHT * 2.4 + UP * 2.6)
-            ar = Arrow(sheet.get_right() + RIGHT * 0.15, mo.get_left() + LEFT * 0.15,
-                       buff=0, color=AMBAR, stroke_width=9)
+            moon_m = self.moon(0.95).move_to(RIGHT * 2.4 + UP * 2.6)
+            ar = Arrow(sheet.get_right() + RIGHT * 0.15, moon_m.get_left() + LEFT * 0.15,
+                       buff=0, color=AMBER, stroke_width=9)
             tag = self.fit(Text("42 dobleces", font=FONT, font_size=46, weight=BOLD,
-                                color=AMBAR), 7.5).next_to(ar, UP, buff=0.3)
+                                color=AMBER), 7.5).next_to(ar, UP, buff=0.3)
             b.play(FadeIn(chip, shift=DOWN * 0.3), run_time=0.45)
             b.play(FadeIn(sheet), Create(fold), run_time=0.5)
             b.play(GrowArrow(ar), FadeIn(tag), run_time=0.6)
-            b.play(FadeIn(mo, scale=0.6), run_time=0.6)
-        hook = VGroup(sheet, fold, mo, ar, tag)
+            b.play(FadeIn(moon_m, scale=0.6), run_time=0.6)
+        hook = VGroup(sheet, fold, moon_m, ar, tag)
 
-        # ---------- el eje ----------
+        # ---------- the axis --------
         axis = Line([BAR_X, Y0, 0], [BAR_X, Y1 + 0.3, 0], stroke_width=5, color="#3A4766")
         base = Line([BAR_X - 0.75, Y0, 0], [4.2, Y0, 0], stroke_width=5, color="#3A4766")
 
-        hitos = [(1e2, "10 cm"), (1e5, "100 m"), (1e8, "100 km")]
+        milestones = [(1e2, "10 cm"), (1e5, "100 m"), (1e8, "100 km")]
         marks = VGroup()
-        for mm, txt in hitos:
+        for mm, txt in milestones:
             y = ypos(mm)
             ln = DashedLine([BAR_X - 0.5, y, 0], [3.9, y, 0], stroke_width=3,
                             color="#33405C", dash_length=0.12)
-            lb = Text(txt, font=FONT, font_size=30, color=GRIS)
+            lb = Text(txt, font=FONT, font_size=30, color=C_GRAY)
             lb.next_to(ln, UP, buff=0.08).align_to(ln, RIGHT)
             marks.add(VGroup(ln, lb))
 
@@ -84,15 +84,15 @@ class Luna(TikTok):
         moon_lb.next_to(moon_line, UP, buff=0.1).align_to(moon_line, RIGHT).shift(LEFT * 0.1)
 
         readout = VGroup(
-            Text("0", font=FONT, font_size=68, weight=BOLD, color=AMBAR),
-            Text("dobleces", font=FONT, font_size=28, color=GRIS),
+            Text("0", font=FONT, font_size=68, weight=BOLD, color=AMBER),
+            Text("dobleces", font=FONT, font_size=28, color=C_GRAY),
             Text("0,1 mm", font=FONT, font_size=44, weight=BOLD, color=WHITE),
         )
         readout[0:2].arrange(RIGHT, buff=0.25, aligned_edge=DOWN)
         readout.arrange(RIGHT, buff=0.5, aligned_edge=DOWN).move_to(UP * 5.6)
 
         bar = Rectangle(width=BAR_W, height=0.02, stroke_width=0,
-                        fill_color=AMBAR, fill_opacity=1)
+                        fill_color=AMBER, fill_opacity=1)
         bar.move_to([BAR_X + BAR_W / 2 + 0.06, Y0, 0], DOWN + LEFT)
 
         with self.beat(1) as b:
@@ -104,14 +104,14 @@ class Luna(TikTok):
         state = {"n": 0}
 
         def goto(bt, n, rt=0.9, extra=None):
-            mm = espesor(n)
+            mm = thickness(n)
             h = max(ypos(mm) - Y0, 0.02)
             new_bar = bar.copy().stretch_to_fit_height(h).move_to(
                 [BAR_X + BAR_W / 2 + 0.06, Y0, 0], DOWN + LEFT)
             nr = VGroup(
-                Text(str(n), font=FONT, font_size=68, weight=BOLD, color=AMBAR),
-                Text("dobleces" if n != 1 else "doblez", font=FONT, font_size=28, color=GRIS),
-                Text(humano(mm), font=FONT, font_size=44, weight=BOLD, color=WHITE),
+                Text(str(n), font=FONT, font_size=68, weight=BOLD, color=AMBER),
+                Text("dobleces" if n != 1 else "doblez", font=FONT, font_size=28, color=C_GRAY),
+                Text(human(mm), font=FONT, font_size=44, weight=BOLD, color=WHITE),
             )
             nr[0:2].arrange(RIGHT, buff=0.25, aligned_edge=DOWN)
             nr.arrange(RIGHT, buff=0.5, aligned_edge=DOWN).move_to(UP * 5.6)
@@ -124,25 +124,25 @@ class Luna(TikTok):
 
         with self.beat(2) as b:
             b.play(FadeIn(readout), FadeIn(bar), run_time=0.5)
-            b.play(Indicate(readout[2], color=AMBAR, scale_factor=1.3), run_time=0.7)
+            b.play(Indicate(readout[2], color=AMBER, scale_factor=1.3), run_time=0.7)
 
         with self.beat(3) as b:
             goto(b, 1, 0.7)
             goto(b, 2, 0.7)
 
         with self.beat(4) as b:
-            goto(b, 10, 1.1, [Flash(marks[0][1], color=AMBAR, line_length=0.3,
+            goto(b, 10, 1.1, [Flash(marks[0][1], color=AMBER, line_length=0.3,
                                     num_lines=12, flash_radius=0.8)])
 
         with self.beat(5) as b:
-            goto(b, 20, 1.1, [Flash(marks[1][1], color=AMBAR, line_length=0.3,
+            goto(b, 20, 1.1, [Flash(marks[1][1], color=AMBER, line_length=0.3,
                                     num_lines=12, flash_radius=0.8)])
 
         with self.beat(6) as b:
-            goto(b, 30, 1.1, [Flash(marks[2][1], color=AMBAR, line_length=0.3,
+            goto(b, 30, 1.1, [Flash(marks[2][1], color=AMBER, line_length=0.3,
                                     num_lines=12, flash_radius=0.8)])
             atm = Text("fuera de la atmósfera", font=FONT, font_size=32,
-                       weight=BOLD, color=CELESTE).move_to([0.9, ypos(1e8) - 0.6, 0])
+                       weight=BOLD, color=C_SKY).move_to([0.9, ypos(1e8) - 0.6, 0])
             b.play(FadeIn(atm, shift=UP * 0.1), run_time=0.5)
 
         with self.beat(7) as b:
@@ -155,11 +155,11 @@ class Luna(TikTok):
                          num_lines=18, flash_radius=1.1), run_time=0.8)
 
         with self.beat(9) as b:
-            over = Text("te pasaste de largo", font=FONT, font_size=44, weight=BOLD, color=VERDE)
+            over = Text("te pasaste de largo", font=FONT, font_size=44, weight=BOLD, color=C_GREEN)
             over.move_to([0.75, ym - 0.95, 0])
             self.fit(over, 5.6)
             b.play(FadeIn(over, shift=UP * 0.15), run_time=0.6)
-            b.play(Circumscribe(over, color=VERDE, buff=0.22, stroke_width=6), run_time=0.9)
+            b.play(Circumscribe(over, color=C_GREEN, buff=0.22, stroke_width=6), run_time=0.9)
 
         with self.beat(10) as b:
             b.play(FadeOut(VGroup(axis, base, marks, moon_line, moon_ic, moon_lb,
@@ -167,10 +167,10 @@ class Luna(TikTok):
             t1 = self.fit(Text("crecimiento", font=FONT, font_size=74, weight=BOLD,
                                color=WHITE), 8.0)
             t2 = self.fit(Text("EXPONENCIAL", font=FONT, font_size=90, weight=BOLD,
-                               color=AMBAR), 8.2)
+                               color=AMBER), 8.2)
             g = VGroup(t1, t2).arrange(DOWN, buff=0.3).move_to(UP * 1.6)
             t3 = self.fit(Text("por eso nadie lo ve venir", font=FONT, font_size=40,
-                               color=GRIS), 7.6).next_to(g, DOWN, buff=0.7)
+                               color=C_GRAY), 7.6).next_to(g, DOWN, buff=0.7)
             b.play(FadeIn(t1, shift=UP * 0.2), run_time=0.5)
             b.play(FadeIn(t2, scale=0.7), run_time=0.6)
             b.play(FadeIn(t3), run_time=0.5)