Minor improvements

.../de/dpunkt/myaktion/controller/DonateMoneyController.java

...de/dpunkt/myaktion/controller/EditCampaignController.java

...punkt/myaktion/controller/EditDonationFormController.java

...e/dpunkt/myaktion/controller/ListCampaignsController.java

...e/dpunkt/myaktion/controller/ListDonationsController.java

src/main/java/de/dpunkt/myaktion/controller/Pages.java

...in/java/de/dpunkt/myaktion/data/CampaignListProducer.java

src/main/java/de/dpunkt/myaktion/data/CampaignProducer.java

src/main/java/de/dpunkt/myaktion/model/Account.java

src/main/java/de/dpunkt/myaktion/model/Campaign.java

src/main/java/de/dpunkt/myaktion/model/DateEntity.java

src/main/java/de/dpunkt/myaktion/model/Donation.java

src/main/java/de/dpunkt/myaktion/model/Organizer.java

...n/java/de/dpunkt/myaktion/resources/CampaignResource.java

...n/java/de/dpunkt/myaktion/resources/DonationResource.java

...main/java/de/dpunkt/myaktion/scheduler/SchedulerBean.java

...ain/java/de/dpunkt/myaktion/services/CampaignService.java

...java/de/dpunkt/myaktion/services/CampaignServiceBean.java

...ain/java/de/dpunkt/myaktion/services/DonationService.java

...java/de/dpunkt/myaktion/services/DonationServiceBean.java