English (Source)
Towers gain experience <Highlight>{{TOWER_EXP_GAIN_CHANGE_PERCENT:percent}}%</> faster but upgrading them with gold costs <N_Highlight>{{LEVEL_UP_COST_CHANGE_PERCENT:percent}}%</> more.
German Translation
Türme erhalten <Highlight>{{TOWER_EXP_GAIN_CHANGE_PERCENT:percent}}%</> schneller Erfahrung, aber das Aufwerten mit Gold kostet <N_Highlight>{{LEVEL_UP_COST_CHANGE_PERCENT:percent}}%</> mehr.