[bisq-network/bisq] Update GUI labels to reflect multiple rate providers (#4406)

[cd2357]

Update the top-right bar labels to better indicate the source of the exchange rate data.

**The shown text for fiat:**

![Screenshot from 2020-08-08 18-53-58](https://user-images.githubusercontent.com/15956136/89718087-ae535f80-d9bc-11ea-892e-85794d942993.png)

**The shown text for alts:**

![Screenshot from 2020-08-08 18-54-11](https://user-images.githubusercontent.com/15956136/89718104-b7443100-d9bc-11ea-801c-f8c25bc48e7a.png)

The tooltip for fiat:

![Screenshot from 2020-08-08 18-47-41](https://user-images.githubusercontent.com/15956136/89718109-c0cd9900-d9bc-11ea-8a64-c02f1385f2cc.png)

**The tooltip for alts:**

![Screenshot from 2020-08-08 18-48-03](https://user-images.githubusercontent.com/15956136/89718113-c6c37a00-d9bc-11ea-99c3-ba5ac425b473.png)

---

Addresses bisq-network/projects#35

Related to #4315
You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4406

-- Commit Summary --

  * Update top-right bar references to price source
  * Correctly map lastRequest timestamp
  * Remove unused methods
  * Rename method
  * Rename timestamp field

-- File Changes --

    M core/src/main/java/bisq/core/provider/price/PriceFeedService.java (29)
    M core/src/main/resources/i18n/displayStrings.properties (1)
    M core/src/main/resources/i18n/displayStrings_de.properties (1)
    M core/src/main/resources/i18n/displayStrings_es.properties (1)
    M core/src/main/resources/i18n/displayStrings_fa.properties (1)
    M core/src/main/resources/i18n/displayStrings_fr.properties (1)
    M core/src/main/resources/i18n/displayStrings_ja.properties (1)
    M core/src/main/resources/i18n/displayStrings_pt-br.properties (1)
    M core/src/main/resources/i18n/displayStrings_pt.properties (1)
    M core/src/main/resources/i18n/displayStrings_ru.properties (1)
    M core/src/main/resources/i18n/displayStrings_th.properties (1)
    M core/src/main/resources/i18n/displayStrings_vi.properties (1)
    M core/src/main/resources/i18n/displayStrings_zh-hans.properties (1)
    M core/src/main/resources/i18n/displayStrings_zh-hant.properties (1)
    M desktop/src/main/java/bisq/desktop/main/MainView.java (24)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4406.patch
https://github.com/bisq-network/bisq/pull/4406.diff

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