Incomplete language support

[hackbarth]

If we try to set language of the API to a language different from 'en', the weather prediction for the day is translated, but all the other interface text remains in English, in this example the weather prediction is in Brazilian Portuguese but the day of the week, the parts of the day and sunrise/sunset information remained in English:

$> wego -owm-lang pt_br
Weather for Auxiliadora, BR

  nublado
☁️  16 (16) °C  

🌞 rise↗ 7:15AM noon↑ 12:31PM set↘ 5:46PM
                            ┌───────┐ 
┌───────────────┬───────────┤  Thu  ├───────────┬───────────────┐
│    Morning    │    Noon   └───┬───┘ Evening   │     Night     │
├───────────────┼───────────────┼───────────────┼───────────────┤
│  nublado      │  nublado      │  chuva leve   │  chuva leve   │
│☁️  16 (16) °C  │☁️  16 (16) °C  │🌦  17 (17) °C  │🌦  16 (16) °C  │
└───────────────┴───────────────┴───────────────┴───────────────┘