Fix localization issue introduced in eda9de89.

In net/hearthstats/resources/Main.properties, the string 'Set your deck
slots ...' was replaced with 't("set_your_deck_slots")', but for some
reason the value of that key was set to
'_bundle.getString("options.label.coin")'.
Merge pull request #213 from cbhl/gh208

Fix localization issue introduced in eda9de89. (#208)