Add a preference which spot updates on articles previously read (they appear with a green dot in Report and Condensed layouts).

Enlarge text labels to make automatic generation of localized nibs easier.
Regenerate english version of GeneratePreferences.strings

(Run ibtool --generate-strings-file lproj/en.lproj/GeneralPreferences.strings lproj/en.lproj/GeneralPreferences.nib,
then make sure the generated file is UTF-8 encoded)
Refactor the french GeneralPreferences.strings, then regenerate the corresponding GeneralPreferences.nib using the english version as a model.

(Adapt the .strings, then run
ibtool --strings-file lproj/fr.lproj/GeneralPreferences.strings --write lproj/fr.lproj/GeneralPreferences.nib lproj/en.lproj/GeneralPreferences.nib
)
Perform the GeneralPreferences.strings and GeneralPreferences.nib rebuild for languages other than French and English.

Hopefully, bindings for a few elements were also corrected in the process.
Merge pull request #157 from barijaona/fix-general-preferences

Fix general preferences