Added documentation for building translations

translations/Readme.txt

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+This folder contains the master file for all the translations (translations.ods)
+as well as any loadable tranlations created from it.
+
+Translations.ods is formatted with the language name in the first row, and all
+translated strings for that language in the rows below. The first column
+contains the ID for the strings in that row. Language ini files are generated
+by concatenating the first column, an equals sign and the column under the
+language name. (see "English (EN-US).ini" for an example) The string replacements
+column gives some context for what the replacement will contain.
+
+The TranslationBuilder project included with this source code can build all the
+translations from the spreadsheet automatically.