Fixing currency functions for german and french. Adding Currency_Forms for DE, FR and NL.

[sarahberanek]

Fixes

by Sarah Beranek

Changes proposed in this pull request:

• Adding CURRENCY_FORMS for German and French
• Replacing old currency functions with updated ones for German and French.
• Adding more CURRENCY_FORMS options for dutch

Status

• READY
• HOLD
• WIP (Work-In-Progress)

How to verify this change

lang='de'                                                                                     
var1 = '49.95'                                                                                                                                 
var2 = '1.01'                                                                              
b = num2words(var1, lang=lang, to='currency', currency='USD')
print(b)                                                               
d = num2words(var2, lang=lang, to='currency', currency='EUR')
print(d) 

the same test for French with setting lang='fr' or Dutch with lang='nl'

Additional notes

I think for most of the languages if there is only an integer value given the currency should be euro/dollar and not cent per default.
I see that there is a possible option is_int_with_cents in the parse_currency_parts function to address this, which is not used yet.

Maybe it is a good idea to propagate this to the specific language to_currency functions?
If you agree - I can do the changes, if I find the time.

[coveralls]

Pull Request Test Coverage Report for Build 662

• 34 of 34 (100.0%) changed or added relevant lines in 7 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 92.944%

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Totals
Change from base Build 660:	-0.01%
Covered Lines:	4864
Relevant Lines:	5142

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 662

• 34 of 34 (100.0%) changed or added relevant lines in 7 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 92.944%

---

Totals
Change from base Build 660:	-0.01%
Covered Lines:	4864
Relevant Lines:	5142

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 669

• 56 of 56 (100.0%) changed or added relevant lines in 8 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 92.966%

---

Totals
Change from base Build 660:	0.01%
Covered Lines:	4877
Relevant Lines:	5155

---

💛 - Coveralls

[erozqba]

Hi @sarahberanek
Thanks a lot for your contribution! We have an small decrease in coverage, could you take a look into the missed lines and add a couple of tests to cover them? We can't merge if the coverage decrease because Github block the merge button!

[sarahberanek]

Hi @erozqba - done! :)