i18n(Miscellaneous): Replace DAG as Dag(en,hi)

[kkumtree]

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Description

This PR updates English(en), Hindi(hi) i18n about using Dag instead of DAG where it appears in UI.

Details

i18n/locales/en/dag.json

-      "modeTooltip": "(...) for easier DAG traversal.",
+      "modeTooltip": "(...) for easier Dag traversal.",

i18n/locales/hi/dag.json

-      "modeTooltip": "(...), जबकि ट्रैवर्स मोड आसान DAG ट्रैवर्सल के लिए क्लिक किए गए टास्क को स्वचालित रूप से सक्रिय फ़िल्टर के रूप में अपडेट करता है।",
+      "modeTooltip": "(...), जबकि ट्रैवर्स मोड आसान Dag ट्रैवर्सल के लिए क्लिक किए गए टास्क को स्वचालित रूप से सक्रिय फ़िल्टर के रूप में अपडेट करता है।",

Related PRs

• [v3-1-test] Align the term Dag in all translations #59155
  • Airflow 3.1.6 (2026-01-13)
• i18n(Ko): Replace DAG as Dag #62920

etc.

Only for two locales, dag.json not updated about modeTooltip

# find . -type f -name "dag.json" | while read -r file; do jq -e '.panel.taskStreamFilter.modeTooltip? | type == "string" and contains("DAG")' "$file" > /dev/null && echo "$file"; done
./hi/dag.json
./en/dag.json

CC. @jscheffl @vatsrahul1001

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[choo121600]

Cool, nice catch!
LGTM