Revert RTL PR

[zsarnett]

Reverts #1966

Fixes:

018-11-03 12:13:19 ERROR (MainThread) [frontend.js.latest.201811030] https://bla.duckdns.org/frontend_latest/app-b743c825.js:89:305 Uncaught TypeError: Cannot read property 'isRTL' of undefined

[rhayun]

can someone help and try to tell me why this error? i cant see it in my dev space

computeRTL(hass) {
    var lang = this.hass.selectedLanguage || this.hass.language;
    return hass.translationMetadata.translations[lang].isRTL || false;
  }

why its said
Uncaught TypeError: Cannot read property 'isRTL' of undefined

if i adding || false?

[balloob]

if lang doesn't exist as a key on translations, the resulting object is undefined. Calling undefined.isRTL is an error.

[rhayun]

if lang doesn't exist as a key on translations, the resulting object is undefined. Calling undefined.isRTL is an error.

how its possible? can someone choose language that doesnt exists in in translations?
if so i can test it before call isRTL