UK Visa refused twice, should I give up? [duplicate]

I am an Algerian citizen, working as a computer scientist in Paris.

I have been refused a tourist visa for UK for the second time despite having strong applying documents, good income, and a rich travel history(I gave all my boarding passes that includes flights to +10 EU countries + canadian visa) The reasons given seem absurd to me, and I really think they just don't want me to visit UK independently from given documents.

 You state that you intend to visit the UK for 4 days and propose tourism. Am I not free to decide how long I want to visit the country depending on my budget and holidays given by me employer ?

In support of this you have submitted your payslips, letter confirming employment and bank statements in French. It is unclear whether your employment is permanent, temporary or fixed term and whether your employer has granted you leave for the stated duration of your trip. I could have agreed with this argument, if I haven't applied with a colleague that has gave the same proof of employment as me(which was in french), and had his visa. Furthermore the visa application required documents are around 50 pages long, and it costs around 50€ to translate one paper, which means I have to spend 2500€ for translating document, this is ridiculous ! For my first application that has been refused too, all documents were in french and this wasn't the reason of the refusal(it was because I applied during summer as a student and I didn't have my new student card yet), they were able to extract information from the application's documents.

I note that the bank statements you have submitted do not correspond with the income you have stated on your Visa Application Form (VAF) or your payslips. This is I think the worst reason, some months I'm paid 2000€ instead of 2100€ because it was a month with one less working day(30 instead of 31)

The bank documents you have provided show large credits not commensurate with your documented income in the time leading up to your visa application. There is no explanation provided regarding the origin of these funds. I am not satisfied these funds are genuinely available for your use and have been provided to you for the sole purpose of obtaining an entry clearance for the UK. I don't know what to say about this, I have other accounts where that a use to transfer money to for savings. I don't know what more I can do to proof that these funds are mine, since they are here in my account for years.

Considering the refusal reasons, the only document I can translate is my certificate of employment and income given by my employer, and since this refusal(one month ago) I have been given an USA visa. So, with these two new elements, is it worth applying again or should I give up ? I'm afraid they will think I'm a bit obsessed if I apply again(which is partially true because UK /Eire is the only part of Europe I haven't visited yet)