ELLIS Institute Tübingen regex misses several papers

[FelixMingl]

The current regex rule for ELLIS Institute Tübingen:

(r"\b(ellis institute tübingen)\b", "ELLIS Institute Tübingen", "Germany"),

This misses several accepted ICLR 2026 papers where the affiliation is written differently in the PDF, for example:

• ELLIS Institute T¨ubingen (broken ü from PDF parsing)
• ELLIS Institute T¨ubingen1 (footnote number attached)

Suggested fix:

(r"\bellis institute t(?:ü|ue|u|¨u)bingen\d*\b", "ELLIS Institute Tübingen", "Germany"),

This handles:

• Tübingen (correct umlaut)
• Tuebingen (common alternative spelling)
• Tubingen (missing umlaut)
• T¨ubingen (broken PDF encoding)
• Tübingen1, T¨ubingen1 etc. (footnote markers)