Changed the way translations are handled removing several lines of, now redundant, code across 6 files.
Updated placeholder names (I like them this way).
Changed placeholders to return numeric value only besides the total playtime.
Placeholders are now as follows:
- %playtime_total%
- %playtime_in_months%
- %playtime_in_days%
- %playtime_in_hours%
- %playtime_in_minutes%
- %playtime_in_seconds%
- %playtime_join_date%