i18n support

1+-------------+------------+------------+---------------+---------------+------------+------------+
2| Aspect      | English    | French     | Chinese       | Japanese      | Arabic     | Hebrew     |
3+-------------+------------+------------+---------------+---------------+------------+------------+
4| Direction   | LTR        | LTR        | LTR/TTB*      | LTR/TTB*      | RTL        | RTL        |
5| Script      | Latin      | Latin      | Simp/Trad     | Kanji/Hira/Ka | Arabic     | Hebrew     |
6| Category    | Western    | Western    | Eastern       | Eastern       | Mid-East   | Mid-East   |
7| Font        | Standard   | Standard   | Special       | Special       | Special    | Special    |
8| Input       | Standard   | Standard   | IME           | IME           | RTL IME    | RTL IME    |
9| Spacing     | Word       | Word       | Char          | Char          | Word       | Word       |
10| MedDRA      | Native     | Yes        | Yes           | Yes           | Yes        | Limited    |
11| Complexity  | Base       | Low        | High          | High          | High       | High       |
12| UI Needs    | Basic      | Basic      | Complex       | Complex       | RTL Layout | RTL Layout |
13| Numbers     | 1,234.56   | 1 234,56   | 1,234.56      | 1,234.56      | ١٬٢٣٤٫٥٦    | 1,234.56   |
14+-------------+------------+------------+---------------+---------------+------------+------------+
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17Core recommendation: Use established i18n framework + medical terminology validation system.
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