Pkgs version, label parameterize and fix

[elbowz]

• I was not able to install locally, so I have updated the packages version
• Fixed a little error, converting isHttp var to a method
• And added the possibility to personalize some UI texts with env variables

Thanks for this amazing and useful project...and mainly for all the ecosystem related to homie (and esp8266).

note: I'm not more fresh with Vue.js, so review my code, please.