Avoid unnecessary translations

[hebasto]

Working on translation, I found these translations introduced in #79, that are unnecessary (assuming the universal nature of the "BTC" string).

[jarolrod]

ACK 19d51a2

Tested that these are all the occurrences in this file, and cross-checked for any occurrences in other files. We already set the notr attribute in other areas of the code such as coincontroldialog.ui, overviewpage.ui, and sendcoinsdialog.ui.

Furthermore, BTC is treated as a symbol or unit of Bitcoin and is untranslatable by nature.

[Sjors]

Concept ACK

[promag]

ACK.

[luke-jr]

Is it really untranslated? What about languages that don't use the Latin alphabet at all?

[hebasto]

Is it really untranslated? What about languages that don't use the Latin alphabet at all?

For example? (not non-Latin languages, but abbreviated name "BTC" in non-Latin languages)

My three non-Latin languages use "BTC", btw.

[luke-jr]

I would expect Russian to use a Cyrillic abbreviation? Possibly Chinese and Japanese to get single-character units at some point?

[hebasto]

I would expect Russian to use a Cyrillic abbreviation? Possibly Chinese and Japanese to get single-character units at some point?

I've made a quick re-check of some multi-language online services. All of them use "BTC" in non-Latin languages.