skills: update skills

skills/translation/references/bilingual-format.md

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+# Bilingual DJ Format
+
+## Layout
+
+Each pair: source line immediately followed by target line. Blank line separates pairs.
+
+```
+source-line
+target-line
+
+source-line
+target-line
+```
+
+NOT:
+```
+source-line
+              ← WRONG: extra blank between source and target
+target-line
+```
+
+## Creating initial bilingual from source only
+
+Every source line gets an empty target placeholder + blank separator:
+
+```
+source-A
+
+source-B
+```
+
+(2 blank lines between consecutive source lines: empty target + separator.)
+
+## Verification
+
+Source line count × 3 − 1 = bilingual line count (before trailing newline strip).