Fix date and time handling in language class:
Fix date and time handling in language class:

- make $_dates public to be accessible to Localisation Manager
- fix typo in date array
- correctly translate date strings without creating duplicates
- ignore case when localizing/standardizing dates

blaXXabla/projet_test_symphony,nils-werner/Bugaroo,benesch/hilton-unar,brendo/symphony-2,tachyondecay/symphony-2,bauhouse/members-forms-ensemble,tachyondecay/symphony-2,jensscherbl/symphony,allen/auth.getsymphony.com,eliksir/norske-webapps,jurajkapsz/symphony-2,yojeek/sym-community,chay83/Symphony-Shopping-Cart-Ensemble,twiro/symphony-2,bauhouse/sym-pagoda,nils-werner/Bugaroo,TheJester12/issueprompt,johnpuddephatt/symphony-2,benesch/hilton-unar,NikoMostWanted/symphony-2,bauhouse/Bugaroo,jdsimcoe/symphony-boilerplate,symphonycms/sym-getsymphony,blaXXabla/projet_test_symphony,psychoticmeow/symphony-2,brendo/symphony-2,builders/collective,twiro/symphony-2,jensscherbl/symphony,wastemobile/Symphony2.3.6,avanteweb/symphony-2,scottkf/keepflippin--on-symphony,henrysingleton/litmusk,bauhouse/sym-todo-list,chay83/Symphony-Shopping-Cart-Ensemble,bauhouse/members-forms-ensemble,yojeek/sym-community,roshinebagha/Symphony-Test,bauhouse/sym-todo-list,jdsimcoe/symphony-boilerplate,astudio/remixhair,ljonka/symphony-2,roshinebagha/Symphony-Test,ayellowraven/projectplaten,symphonycms/symphony-2,bauhouse/Piano-Sonata,symphonycms/symphony-2,rzantolas/Symphony-Test,bauhouse/Bugaroo,allen/auth.getsymphony.com,ljonka/symphony-2,DeuxHuitHuit/symphony-2,mazedigital/jcilearn,DeuxHuitHuit/symphony-2,avanteweb/symphony-2,TheJester12/issueprompt,jdsimcoe/symphony-boilerplate,builders/collective,bauhouse/sym-pears,NikoMostWanted/symphony-2,ahwayakchih/symphony-2,michael-e/symphony-2,thebestsophist/personal-health-diary,eliksir/norske-webapps,ayellowraven/projectplaten,astudio/remixhair,psychoticmeow/symphony-2,alexnantel88/symphony-2,BloodBrother/symphony-2,jdsimcoe/symphony-boilerplate,mazedigital/jcilearn,rzantolas/Symphony-Test,bauhouse/sym-pagoda,davjand/Checkout-Ensemble,wastemobile/Symphony2.3.6,alexnantel88/symphony-2,davjand/Checkout-Ensemble,henrysingleton/litmusk,builders/sym-bootstrap,TheJester12/issueprompt,BloodBrother/symphony-2,Titch/Symph-test,jonmifsud/symphony-2,jurajkapsz/symphony-2,bauhouse/Piano-Sonata,thebestsophist/personal-health-diary,johnpuddephatt/symphony-2,jonmifsud/symphony-2,Titch/Symph-test,builders/sym-bootstrap,bauhouse/sym-pears,DavidForster/symphony-2,eliksir/norske-webapps,michael-e/symphony-2,ahwayakchih/symphony-2,DavidForster/symphony-2,symphonycms/sym-getsymphony,mazedigital/jcilearn